2011 imac 27 ram upgrade

2011 imac 27 ram upgrade DEFAULT

Install memory in an iMac

Get memory specifications and learn how to install memory in iMac computers.

Choose your iMac model

If you're not sure which iMac you have, you can identify your iMac and then select it from the list below.

27-inch

  • iMac (Retina 5K, 27-inch, 2020)
  • iMac (Retina 5K, 27-inch, 2019)
  • iMac (Retina 5K, 27-inch, 2017)
  • iMac (Retina 5K, 27-inch, Late 2015)
  • iMac (Retina 5K, 27-inch, Mid 2015)
  • iMac (Retina 5K, 27-inch, Late 2014)
  • iMac (27-inch, Late 2013)
  • iMac (27-inch, Late 2012)
  • iMac (27-inch, Mid 2011)
  • iMac (27-inch, Mid 2010)
  • iMac (27-inch, Late 2009)

24-inch

 

21.5-inch

  • iMac (Retina 4K, 21.5-inch, 2019)3
  • iMac (Retina 4K, 21.5-inch, 2017)3
  • iMac (21.5-inch, 2017)3
  • iMac (Retina 4K, 21.5-inch, Late 2015)2
  • iMac (21.5-inch, Late 2015)2
  • iMac (21.5 inch, Mid 2014)3
  • iMac (21.5-inch, Late 2013)3
  • iMac (21.5-inch, Late 2012)3
  • iMac (21.5-inch, Mid 2011)
  • iMac (21.5-inch, Mid 2010)
  • iMac (21.5-inch, Late 2009)

20-inch

17-inch

 

 

iMac (Retina 5K, 27-inch, 2020)

Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots4
Base memory8GB (2 x 4GB DIMMs)
Maximum memory128GB (4 x 32GB DIMMs)

For optimal memory performance, DIMMs should be the same capacity, speed, and vendor. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

  • PC4-21333
  • Unbuffered
  • Nonparity
  • 260-pin
  • 2666MHz DDR4 SDRAM

If you have mixed capacity DIMMs, see the install memory section for installation recommendations.

iMac (Retina 5K, 27-inch, 2019)

Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots4
Base memory8GB (2 x 4GB DIMMs)
Maximum memory64GB (4 x 16GB DIMMs)

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

  • PC4-21333
  • Unbuffered
  • Nonparity
  • 260-pin
  • 2666MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, 2017)

Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots4
Base memory8GB (2 x 4GB DIMMs)
Maximum memory64GB (4 x 16GB DIMMs)

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

  • PC4-2400 (19200)
  • Unbuffered
  • Nonparity
  • 260-pin
  • 2400MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, Late 2015)

Get memory specifications for iMac (Retina 5K, 27-inch, Late 2015), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots4
Base memory8GB
Maximum memory32GB

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

  • PC3-14900
  • Unbuffered
  • Nonparity
  • 204-pin
  • 1867MHz DDR3 SDRAM

For these 27-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

  • iMac (Retina 5K, 27-inch, Mid 2015)
  • iMac (Retina 5K, 27-inch, Late 2014)
  • iMac (27-inch, Late 2013)
  • iMac (27-inch, Late 2012)

Memory specifications

These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Number of memory slots4
Base memory8GB
Maximum memory32GB

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

  • PC3-12800
  • Unbuffered
  • Nonparity
  • 204-pin
  • 1600MHz DDR3 SDRAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

  1. Disconnect the power cord and all other cables from your computer.
  2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
  3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
  4. Open the memory compartment door by pressing the small grey button located just above the AC power port:

  5. The memory compartment door will open as the button is pushed in. Remove the compartment door and set it aside:

  6. A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM. Locate the two levers on the right and left sides of the memory cage. Push the two levers outward to release the memory cage:

  7. After the memory cage is released, pull the memory cage levers toward you, allowing access to each DIMM slot.
  8. Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM. When reinstalling DIMMs, the notch must be oriented correctly or the DIMM won't fully insert:

  9. Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot. When you insert a DIMM, make sure to align the notch on the DIMM to the DIMM slot. Find your model below for specific installation instructions and notch locations:
    • iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly left of the middle. If your DIMMs are mixed in capacity, minimize the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible.
      Slot numbers for iMac (Retina 5K, 27-inch, 2020)
    • iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly left of the middle:
    • iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left:
    • iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015, and Late 2015) DIMMs have a notch on the bottom right:
  10. After you install all of your DIMMs, push both memory cage levers back into the housing until they lock into place:
  11. Replace the memory compartment door. You don't need to press the compartment door release button when replacing the compartment door.
  12. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.

For these 27-inch and 21.5-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

  • iMac (27-inch, Mid 2011)
  • iMac (21.5-inch, Mid 2011)
  • iMac (27-inch, Mid 2010)
  • iMac (21.5-inch, Mid 2010)
  • iMac (27-inch, Late 2009)
  • iMac (21.5-inch, Late 2009)

Memory specifications

Number of memory slots4
Base memory4GB (but is configured to order)
Maximum memory16GB
For iMac (Late 2009), you can use 2GB or 4GB RAM SO-DIMMs of 1066MHz DDR3 SDRAM in each slot. For iMac (Mid 2010) and iMac (Mid 2011), use 2GB or 4GB RAM SO-DIMMs of 1333MHz DDR3 SDRAM in each slot.

 Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2011)iMac (Mid 2010)iMac (Late 2009)
PC3-10600PC3-10600PC3-8500
UnbufferedUnbufferedUnbuffered
NonparityNonparityNonparity
204-pin204-pin204-pin
1333MHz DDR3 SDRAM1333MHz DDR3 SDRAM1066MHz DDR3 SDRAM

i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot.

Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ("Top" and "bottom" slots refer to the orientation of the slots in the pictures below. "Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand.)

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

  1. Disconnect the power cord and all other cables from your computer.
  2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
  3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
  4. Using a Philips screwdriver, remove the RAM access door in the bottom of your computer:
     Removing the RAM access door
  5. Remove the access door and set it aside.
  6. Untuck the tab in the memory compartment. If you're replacing a memory module, gently pull the tab to eject any installed memory module:
     Untucking the tab in the memory compartment
  7. Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.
  8. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly:
     Pressing the DIMM up into the slot
  9. Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
     Tucking the tabs above the memory DIMMs
  10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 24-inch and 20-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

  • iMac (24-inch, Early 2009)
  • iMac (20-inch, Early 2009)
  • iMac (24-inch, Early 2008)
  • iMac (20-inch, Early 2008)
  • iMac (24-inch Mid 2007)
  • iMac (20-inch, Mid 2007)

Memory specifications

These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.

The maximum amount of random-access memory (RAM) you can install in each computer is:

ComputerMemory TypeMaximum Memory
iMac (Mid 2007)DDR24GB (2x2GB)
iMac (Early 2008)DDR24GB (2x2GB)
iMac (Early 2009)DDR38GB (2x4GB)

You can use a 1GB or 2GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). Use 1GB, 2GB, or 4GB modules in each slot for the iMac (Early 2009).

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

iMac (Mid 2007)iMac (Early 2008)iMac (Early 2009)
PC2-5300PC2-6400PC3-8500
UnbufferedUnbufferedUnbuffered
NonparityNonparityNonparity
200-pin200-pin204-pin
667MHz DDR2 SDRAM800MHz DDR2 SDRAM1066MHz DDR3 SDRAM

DIMMs with any of the following features aren't supported:

  • Registers or buffers
  • PLLs
  • Error-correcting code (ECC)
  • Parity
  • Extended data out (EDO) RAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After your iMac cools down, follow these steps:

  1. Disconnect the power cord and all other cables from your computer.
  2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
  3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
  4. Using a Philips screwdriver, remove the RAM access door in the bottom of the computer:
     Removing the RAM access door in the bottom of the computer
  5. Remove the access door and set it aside.
  6. Untuck the tab in the memory compartment. If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module:
     Untucking the tab in the memory compartment
  7. Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.
  8. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly.
  9. Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
     Reinstalling the memory access door
  10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 20-inch and 17-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

  • iMac (20-inch Late 2006)
  • iMac (17-inch, Late 2006 CD)
  • iMac (17-inch, Late 2006)
  • iMac (17-inch, Mid 2006)
  • iMac (20-inch, Early 2006)
  • iMac (17-inch, Early 2006)

Memory specifications

Number of memory slots2
Base memory1GBTwo 512MB DIMMs; one in each of the memory slotsiMac (Late 2006)
512MBOne DDR2 SDRAM installed into the top slotiMac (17-inch Late 2006 CD)
512MBTwo 256MB DIMMs; one in each of the memory slotsiMac (Mid 2006)
512MBOne DDR2 SDRAM installed into the top slotiMac (Early 2006)
Maximum memory4GB2 GB SO-DIMM in each of the two slots*iMac (Late 2006)
2GB1GB SO-DIMM in each of the two slotsiMac (17-inch Late 2006 CD)
iMac (Early 2006)
Memory card specificationsCompatible:
- Small Outline Dual Inline Memory Module (DDR SO-DIMM) format
- PC2-5300
- Nonparity
- 200-pin
- 667 MHz
- DDR3 SDRAM
Not compatible:
- Registers or buffers
- PLLs
- ECC
- Parity
- EDO RAM

For best performance, fill both memory slots, installing an equal memory module in each slot.

*iMac (Late 2006) uses a maximum of 3 GB of RAM.

Installing memory in the bottom slot

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

  1. Disconnect the power cord and all other cables from your computer.
  2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
  3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
  4. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
     Removing the RAM access door on the bottom of the iMac
  5. Move the DIMM ejector clips to their fully open position:
     Moving the DIMM ejector clips to their fully open position
  6. Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM:
     Inserting RAM SO-DIMM into the bottom slot
  7. After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
  8. Close the ejector clips:
     Closing the ejector clips
  9. Reinstall the memory access door:

     Reinstalling the memory access door
  10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Confirm that your iMac recognizes its new memory

After you install memory, you should confirm that your iMac recognizes the new RAM by choosing Apple () menu > About This Mac.

The window that appears lists the total memory, including the amount of memory that originally came with the computer plus the newly added memory. If all the memory in the iMac has been replaced, it lists the new total of all installed RAM.

For detailed information about the memory installed in your iMac, click System Report. Then choose Memory under the Hardware section in the left side of System Information.

If your iMac doesn’t start up after you install memory

If your iMac doesn’t start up or turn on after you install additional memory, check each of following, then try to start your iMac again.

  • Verify that the added memory is compatible with your iMac.
  • Visually inspect each DIMM to ensure they are correctly installed and fully seated. If one DIMM sits higher or is not parallel to the other DIMMs, remove and inspect the DIMMs before reinstalling them. Each DIMM is keyed and can only be inserted in one direction.
  • Confirm that the memory cage levers are locked into place.
  • Make sure to let the memory initialization complete during startup. Newer iMac models perform a memory initialization procedure during startup after you upgrade memory, reset NVRAM, or rearrange DIMMs. This process can take 30 seconds or more and the display of your iMac remains dark until the process completes.
  • Disconnect all attached peripherals other than keyboard/mouse/trackpad. If the iMac begins working correctly, reattach each peripheral one at a time to determine which one is preventing the iMac from operating correctly. 
  • If the issue persists, remove the upgraded DIMMs and reinstall the original DIMMs. If the iMac works correctly with the original DIMMs, contact the memory vendor or place of purchase for assistance.

If your iMac makes a tone after you install memory

iMac models introduced before 2017 might make a warning sound when you start up after installing or replacing memory:

  • One tone, repeating every five seconds signals that no RAM is installed.
  • Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check.

If you hear these tones, confirm that the memory you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If your Mac continues to make the tone, contact Apple Support.

 

1. iMac (24-inch, M1, 2021) has memory that is integrated into the Apple M1 chip and can't be upgraded. You can configure the memory in your iMac when you purchase it.
2. Memory in iMac (21.5-inch, Late 2015), and iMac (Retina 4K, 21.5-inch, Late 2015) is not upgradeable.
3. Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), iMac (21.5-inch, Mid 2014), iMac (21.5-inch, 2017), iMac (Retina 4K, 21.5-inch, 2017), and iMac (Retina 4K, 21.5-inch, 2019). If the memory in one of these computers needs repair service, contact an Apple Retail Store or Apple Authorized Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorized Service Provider can help. Before you schedule an appointment, confirm that the specific Apple Authorized Service Provider offers memory upgrade services.

Published Date: 

Sours: https://support.apple.com/en-us/HT201191

Maximum memory for 2011 iMac

All 2011 iMacs will support 32GB unofficially except for the late 2011 iMac "Core i3" 3.1 21.5-Inch (MC978LL/A - iMac12,1 - A1311 - 2496) which appears to be capped by EFI at 8GB.

You can check out your specific iMac by finding it on this list, then checking out the RAM section:

http://www.everymac.com/systems/apple/imac/index-imac.html

Also, here's a list of the unofficial max ram support for every Apple computer since the G3:

http://www.everymac.com/systems/by_capability/actual-maximum-ram-capacity-of-macs.html

Note that Apple may update the EFI at any time and enforce it's stated maximum RAM, and of course Apple won't support going above the maximum RAM.

Also keep in mind that you have to match Apple's memory timing specifications for new memory very carefully. I found with my Macbook Pro that getting "close enough" still resulted in an occasionally flaky system, and I had to not only get the correct memory speed, but the same timing for it to work. That said, it does support twice as much memory as Apple states, and many people do find success adding more memory than apple recommends.

answered Apr 2 '12 at 17:21

Adam DavisAdam Davis

8,6331212 gold badges5555 silver badges8585 bronze badges

Sours: https://apple.stackexchange.com/questions/47328/maximum-memory-for-2011-imac
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imac-ram-cage-1

When you buy a new iMac from Apple, it can be costly to upgrade the RAM. For example, upgrading a new iMac from 8GB of RAM to 32GB will cost you an extra $600 through Apple's website. However, you have a much more wallet-friendly way to add RAM to an iMac: Do it yourself. Third-party sites like Other World Computing, aka OWC, and Crucial sell the same amount of RAM for around $150. That's a savings of $450. All you need to do is install it, which Apple has made relatively easy.

Even if you aren't buying a new iMac, upgrading the RAM on your old computer is a quick and affordable way to give your computer more multitasking juice to handle all of those open tabs in your Chrome browser.

Watch a step-by-step video below of the entire process from figuring out what iMac model you have to installing the actual RAM modules.

27-inch iMac vs. 21.5-inch iMac RAM access

iMacs come in two sizes -- 27-inch and 21.5-inch models. Since late 2012, 27-inch models have a door behind the stand that gives you easy access so you can add more RAM. If you have a pre-2011 27-inch or a 21.5-inch iMac, there's an access panel in the bottom grille of the computer.

Unfortunately, if you have a 21.5-inch model made after 2011 or an iMac Pro, there isn't a way to easily access RAM. Instead, you have to take apart most of the iMac to add more.

Identify your iMac model and max amount of RAM

Before you can install new RAM, you need to determine what kind of iMac you have. Look for either the year your computer came out or the model number. To do this:

1. Go to the Apple menu.

2. Select About This Mac.

3. Find the year your iMac was released. For example, mine is: iMac (27-inch, late 2013).

4. Also, look at the memory line to see how much RAM your computer already has.

5. Depending on which version of MacOS your computer is running, there may be a Memory tab you can click to view how much RAM you have and how many slots it's occupying. 

To find the model number, go back to the main About This Mac tab and click the System Report button. A hardware overview screen will appear. Go to the line that has the model identifier. In this case, mine is iMac14,2.

To find out the maximum amount of RAM your iMac can handle, check out this Apple Support page. Most iMacs from the past eight years can handle 32GB of RAM, and some can go as high as 128GB. A new iMac Pro can top out at 512GB.

Now playing:Watch this: Apple iMac 2019 hits new highs

1:29

Where to buy iMac RAM and how much

Now that you're armed with more knowledge about your computer, you need to find a place to buy RAM. There are many vendors, but I highly recommend OWC and Crucial. RAM prices are competitive between the two sites but can fluctuate. Also for this article, Crucial provided us with the RAM.

Both sites can help you find the correct type of RAM for your machine. Probably the biggest choice you'll have to make is how much to add. For example, my 2013 iMac came with 8GB of RAM (two sticks of 4GB). The computer has four slots, with two of them filled. I could just buy two 8GB modules of (16GB total) and add them to the two empty slots. That would bring my iMac from 8GB of RAM to a total of 24GB.

Instead, I opted to remove those two sticks of 4GB RAM that came with my iMac and put in four sticks of 8GB RAM for a total of 32GB, the maximum supported on my iMac. But the choice really comes down to how old your computer is and how you use it. One advantage of upgrading RAM on an older iMac is that it's relatively affordable. Adding 16GB of RAM will cost you around $80.

I recommend installing RAM in pairs. For example, add two modules of 8GB of RAM instead of a single module of 16GB of RAM. It's not so much about cost savings, as it is a performance consideration.  Intel supports dual-channel architecture, which is optimized for memory in pairs. That said, it's not entirely clear how much of a performance hit your computer would take if you just installed a single stick of RAM.

imac-ram-install-2-1

Installing RAM in a 27-inch iMac

Once you have your RAM and are ready to install, shut down your iMac and give it time to cool off.

1. Disconnect the power cord and any other cables connected to your iMac.

2. Place a soft, clean towel on a flat surface to prevent scratching the screen.

3. Holding the sides, lay the computer slowly face down on the towel.

4. Find the small gray button in the power port and press it to open the memory compartment door. I used a spudger tool to get a little more purchase.

imac-ram-door-button-1

5. The button raises the edge of the door. So keep it depressed until you can remove the compartment door completely. Once off, set the door off to the side. The inside of the door has a diagram that shows how the RAM pop-up mechanism works and which way the RAM modules fit in.

6. Locate the two levers on the right and left side and push them outward to release the memory cage.

7. Pull the memory cage levers toward you, to lift the cage for easier access.

8. If you are removing the existing RAM from your iMac, pull the module straight up and out. Note the location of the notch on the bottom of the RAM so that you can orient the new RAM correctly. Depending on which iMac you have, the RAM notch might need to be oriented on the left or right. I'm installing RAM on a 27-inch, late-2013 iMac, so for me the notch needs to be on the right side.

imac-ram-notch-1

9. Install the new RAM by orienting the notch the correct way, setting it down in the slot and pressing firmly until you feel and hear it click into the slot. If you're installing only two new sticks of RAM place them in spaced apart. For example, use the first and third slot or the second and fourth slots.

10. Once all your RAM is installed, put the door back on, stand your iMac upright and plug it back in.

11. Turn your Mac on and go to the Apple menu.

12. Select About This Mac.

13. Look at the memory line or memory tab to make sure your new RAM shows up. 

Troubleshooting tones and RAM that doesn't show up

Depending on how old your iMac is you might hear a tone after you restart it. After installing RAM, iMacs from before 2017 might make a warning sound when you first start them up. If you hear one tone repeating every 5 seconds it means that no RAM is installed. In that case, double-check your installed RAM and make sure it's properly seated in its slot.

If you hear three successive tones, repeating with a 5-second pause in between, it means that the RAM you installed didn't pass a data integrity check. If that happens, double-check that the memory you installed is actually compatible with your model of iMac and try reseating the memory. If your Mac continues to make the tone, then it's time for a Genius Bar appointment.

For more about Macs, check out our review of MacOS Catalina and all the games you can play on Apple Arcade. 

Originally published earlier this week.

Sours: https://www.cnet.com/tech/computing/imac-ram-upgrade-heres-an-affordable-way-to-improve-multitasking/
iMac mid 2011 27\

RAM Upgrades

There are two types of “memory” in a computer, RAM (Random Access memory) and drive storage. Without getting too technical, RAM gives your computer a high-speed temporary work space. It’s where apps and data live while you are actively using them. If you have more RAM it means that your iMac will normally feel faster as you are using apps, especially if you are opening multiple apps, or web browser tabs, at the same time.

The minimum amount of RAM that Apple puts into an iMac now is 8GB. Up to very recently, there were more 4GB iMacs out there, but I would say that if you have less than 8GB, you will see a performance boost from increasing your RAM.

Apple have made several different versions of the iMac, so to see if there are compatible upgrades for your iMac, just refer to the table below. Note that if you wish to find out a bit more about how much memory your iMac currently has, and whether you’re using a lot of that up during everyday tasks, you can check our free guide here


21.5-inch iMac RAM Upgrades


Upgrading the memory on this model of iMac is a bit more complicated than a standard Windows based computer. This is because Apple have designed this iMac with the memory soldered to the Main Logic Board inside. Apple don’t offer upgrades on this iMac, but if you’re serious about getting better performance from your iMac, we can help.

These kinds of upgrades cost a bit more than a standard memory upgrade, since we’re changing the Main Logic Board, memory and processor inside (yep, that’s soldered on too). However, the upgrade will still be a fraction of the cost of a new iMac. Get in touch using our contact form below if you’d like a quote. Try to include the serial number of your iMac too, just so we can double check it’s not a model which is much simpler to upgrade.

Storage Upgrades

Fusion Drives and Flash Storage

If RAM is for storing apps and data when they are in use, the “hard drive” in your iMac is for storing everything permanently. It stores all your pictures, emails, apps and any other data. I say “hard drive”, but the more modern technology is a “solid state drive” or “flash drive” in Apple parlance.

In general terms, if you have a hard drive in your computer, and you upgrade to a Flash Drive, then you will see a huge performance difference. Your iMac will start up much faster, apps will load quicker and just generally, your computer will feel a lot more responsive. Have a look at the table below. If your iMac supports two drives, you may be able to upgrade to a new Flash Drive and keep your existing hard drive for extra storage space. The Apple Certified Technicians at SimplyFixIt can give you advice on what is the best size Flash Drive for your iMac.


One of our Apple certified engineers, installing a storage drive upgrade on an iMac

SATA versus PCIe

You might notice that in many instances we talk about Flash Drives when referring to Apple products. And if you’ve checked our table below to see which connections your iMac has, you will see us mention PCIe as well as SATA. SATA is your standard form of storage connection, and since about 2011, Apple’s SATA connections have supported transfer rates of up to about 600MB/s. That’s SATA 3, which is advertised as 6Gb/s. Notice the lower case ‘b’ though? That’s because 6Gb/s is 6 Gigabits per second, and not 6 Gigabytes (which would be written GB/s).

I’m explaining the difference because if you’re considering upgrading your storage and your iMac has a SATA connection and a PCIe connection, it’s worth knowing that the PCIe port is actually much faster. You cannot just plug in any standard type of SSD though. It must be a Flash Drive which is certified for your Apple product. In addition to looking very different, these Flash Drives also include error checking and hardware encryption – making them very valuable.

Installing a PCI express Flash Drive into a MacBook

The speed of the PCIe connection will vary between different models, and we measure the speed by counting the number of lanes that the connection supports. Think of lanes as bandwidth. The new 2017 iMac has a PCIe connection with 4 lanes, and if you chose to have your iMac shipped with an SSD (Flash Drive) then it will have a read speed of approximately 2,800MB/s. That’s not a typo. This Flash Drive is almost 5 times faster than the fastest SATA SSD, though the technology is more expensive.

Why not just keep the same size?

It may be that your current hard drive is nearly at full capacity, and simply swapping over to a Flash Drive at the same size won’t help. It could be that you don’t use all the space on your hard drive, and never will, and therefore buying a Flash Drive of the same size would be a waste of money. That’s the thing about Flash Drives; they cost more than hard drives. They are cheaper than ever before, and definitely represent the best value performance boost for an iMac, but if you needed a 512GB or a 1TB Flash Drive, it is definitely still an expensive upgrade.

What are Fusion Drives?

If you do have a lot of data, 1TB or more, and don’t want to invest in a flash drive of that capacity, there are still options for you. We can fit a Fusion Drive to your computer. This is a combination of hard drive and flash drive, which macOS is able to use as one single drive. It typically gives a boost of 3.5x performance when working on large files. Even just starting your iMac should be a lot faster, maybe even twice as fast.

Drive technology comparisons

Read or writeMegabytes per second
Flash Drive
Write Speed 208 MB/s
Read speed 140 MB/s
Fusion Drive
Write speed 127 MB/s
Read speed 129 MB/s
Hard Drive
Write speed 38 MB/s
Read speed 25 MB/s
Read or writeMegabytes per second
Flash Drive
Write Speed 440 MB/s
Read speed 477 MB/s
Fusion Drive
Write speed 325 MB/s
Read speed 482 MB/s
Hard Drive
Write speed 173 MB/s
Read speed 174 MB/s

Special Note

Our information below is correct for all standard iMac models. However, some iMac models can be upgraded at the point of ordering to feature an additional storage connection. That means that some 27-inch iMac from 2010 onwards will have three storage connections inside. Get in touch if you’d like help identifying if your iMac is in this category

21.5-inch iMac storage upgrades


  • A picture of an apple iMac from 2011

    iMac 21.5-inch (2009 – 2011)

    Bigger Hard Drive: 
    Yes
    Flash Drive:: 
    Yes
    Fusion Drive:: 
    Yes
    Max Storage drives: 
    2
    Connections:
    2x SATA
  • A picture of an apple iMac from 2013

    iMac 21.5-inch (2012-Early 2013)

    Bigger Hard Drive: 
    Yes
    Flash Drive:: 
    Yes
    Fusion Drive:: 
    Yes
    Max Storage drives: 
    2
    Connections:
    2x SATA
  • A picture of a Retina apple iMac from 2017

    iMac 21.5-inch (Late 2013-2017)

    Bigger Hard Drive: 
    Yes
    Flash Drive:: 
    Yes
    Fusion Drive:: 
    Yes
    Max Storage drives: 
    2
    Connections:
    SATA, PCIe

27-inch iMac storage upgrades


CPU Upgrades

The CPU (Central Processing Unit or ‘processor’) is an important part of almost every computer. The CPU sends signals to control the other parts of the computer, almost like how a brain controls a body. The faster your CPU, the quicker tasks will be completed. Generally, we advise that you consider which processor is right for you before you buy your Mac, because Apple won’t upgrade this for you later.

But that’s where we can help you. The team of Apple certified technicians at SimplyFixIt have carefully disassembled almost every type of iMac to date, and have put a list together of those which can be upgraded. In most cases, we can carefully disassemble your iMac and actually lift out the CPU and swap that for an upgraded model. That will impact the performance of your iMac in a huge way, especially if you take on large workloads.

Even in cases where the processor is soldered to the Main Logic Board, we can still upgrade your iMac, but it’s going to cost a bit more. I’d say that if you’re serious about getting some extra juice, you should definitely get in touch – this upgrade is still much cheaper than buying a new iMac. We’ve highlighted below which iMac models have a removeable CPU and will therefore, generally, cost a bit less to upgrade.

TwitterFacebookLinkedInSours: https://simplyfixit.co.uk/apple-repairs/apple-imac-upgrades/

27 2011 ram upgrade imac

iMac Intel 27" EMC 2429 RAM Replacement

  • Loosen the three Phillips screws securing the access door to the bottom edge of your iMac.These screws will remain captive in the access door.
    • Loosen the three Phillips screws securing the access door to the bottom edge of your iMac.

    • These screws will remain captive in the access door.

    • Remove the access door from your iMac.

    • During reassembly, fasten the access door loosely and align it with the pocket cut into the outer case of the iMac before fully tightening the screws.

    Edit

  • Use your fingers or the tip of a spudger to slide the black plastic RAM tray pull tab out of the RAM slot.
    • Use your fingers or the tip of a spudger to slide the black plastic RAM tray pull tab out of the RAM slot.

    Edit

  • Pull the black plastic tab away from the iMac to eject the RAM chip from its socket.The RAM modules are firmly seated and may require a fair amount of force to remove.
    • Pull the black plastic tab away from the iMac to eject the RAM chip from its socket.

    • The RAM modules are firmly seated and may require a fair amount of force to remove.

    • Use your fingers to slide the RAM chip out of its socket.

    • If necessary, repeat this process for the other RAM module(s).

    Edit

  • Sours: https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2429+RAM+Replacement/7570
    iMac 27 RAM memory upgrade Easy How To Tutorial Mid 2011

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