iMac: How to remove or install memory - Middlebury

iMac: How to remove or install memory
6/12/12 9:11 AM
iMac: How to remove or install memory
Last Modified: October 11, 2011
Summary
Products Affected
Article: HT1423
Learn how to remove or install memory in your iMac
iMac, iMac (17-inch, Late 2006 CD), iMac (17-inch, Late
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computer.
2006), iMac (20-inch Late 2006), iMac (20-inch, Early
Rating:
2008), iMac (20-inch, Early 2009), iMac (20-inch, Mid
(3608 Responses)
2007), iMac (20-inch, Mid 2009), iMac (21.5-inch, Late
2009), iMac (21.5-inch, Mid 2010), iMac (21.5-inch, Mid
2011), iMac (24-inch Mid 2007), iMac (24-inch, Early 2008),
…more
iMac (24-inch, Early 2009), iMac (27-inch, Late 2009), iMac
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English
(27-inch, Mid 2010), iMac (27-inch, Mid 2011), iMac (Early
2006 17-inch), iMac (Early 2006 20-inch), iMac (Mid 2006
Choose your model
To identify your iMac model, use the information in How to identify iMac models.
17-inch
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iMac (20-inch, Late 2006)
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21.5-inch
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iMac (27-inch, Mid 2010)
iMac (27-inch, Late 2009)
iMac (Late 2009) and later:
Installing or replacing memory
Applicable models
iMac
iMac
iMac
iMac
iMac
iMac
(27-inch, Mid 2011)
(21.5-inch, Mid 2011)
(27-inch, Mid 2010)
(21.5-inch, Mid 2010)
(27-inch, Late 2009)
(21.5-inch, Late 2009)
Memory specifications
These iMac models have these memory specifications:
Number of memory slots
4
Base memory
4 GB (but is configured to order)
Maximum memory
16 GB
Note: For the iMac (Late 2009) models, you can use 2 GB or 4 GB RAM SO-DIMMs of 1066 MHz
DDR3 SDRAM in each slot. For the iMac (Mid 2010) and iMac (Mid 2011) models, use 2 GB or 4 GB
RAM SO-DIMMs of 1333 MHz 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)
http://support.apple.com/kb/HT1423#1
iMac (Late 2009)
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PC3-10600
PC3-10600
PC3-8500
Unbuffered
Unbuffered
Unbuffered
Nonparity
Nonparity
Nonparity
204-pin
204-pin
204-pin
1333MHz DDR3 SDRAM
1333MHz DDR3 SDRAM
1066MHz DDR3 SDRAM
Additional notes 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).
Removing or installing memory
Warning: The internal components of your iMac computer can be warm. If you have been using your iMac
computer, wait ten minutes after shutting down the computer to let the internal components cool before
continuing.
To install memory into the bottom slot, follow these instructions:
1. Turn off your computer by choosing the Apple () menu, then Shut Down.
2. Disconnect all cables and the power cord from your computer.
3. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the LCD display.
4. Hold the sides of the computer and slowly lay the computer face down.
5. Using a Philips screwdriver, remove the RAM access door in the bottom of your computer.
6. Remove the access door and set it aside.
7. Untuck the tab in the memory compartment. If you are replacing a memory module, gently pull the tab to eject
any installed memory module.
http://support.apple.com/kb/HT1423#1
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8. Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SODIMM as shown below.
9. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory
correctly.
10. Tuck the tabs above the memory DIMMs, and reinstall the memory access door.
http://support.apple.com/kb/HT1423#1
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11. Stand the computer in its upright position, reconnect the power cord and all other cables to the computer, then
start up the computer.
Back to top
Applicable models
iMac (24-inch, Early 2009)
iMac
iMac
iMac
iMac
(20-inch, Early 2009)
(24-inch, Early 2008)
(20-inch, Early 2008)
(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 the computer is:
Computer
Memory Type Maximum Memory
iMac (Mid 2007)
DDR2
4GB (2x2GB)
iMac (Early 2008) DDR2
4GB (2x2GB)
iMac (Early 2009) DDR3
8GB (2x4GB)
You can use a 1GB or 2 GB 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)
PC2-5300
PC2-6400
PC3-8500
Unbuffered
Unbuffered
Unbuffered
Nonparity
Nonparity
Nonparity
200-pin
200-pin
204-pin
667MHz DDR2 SDRAM
800MHz DDR2 SDRAM
1066MHz DDR3 SDRAM
http://support.apple.com/kb/HT1423#1
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DIMMs with any of the following features are not supported:
Registers or buffers
PLLs
Error-correcting code (ECC)
Parity
Extended data out (EDO) RAM
Removing or installing memory
Warning: The internal components of your iMac computer can be warm. If you have been using your iMac
computer, wait ten minutes after shutting down the computer to let the internal components cool before
continuing.
To install memory into the bottom slot, follow these instructions:
1. Turn off your computer by choosing the Apple () menu, then Shut Down.
2. Disconnect all cables and the power cord from your computer.
3. Place a soft, clean towel or cloth on the desk or surface to prevent scratching the LCD display.
4. Hold the sides of the computer and slowly lay the computer face-down.
5. Using a Philips screwdriver, remove the RAM access door in the bottom of the computer.
6. Remove the access door and set it aside.
7. Untuck the tab in the memory compartment. If you are replacing a memory module, untuck the tab and pull it
to eject any installed memory module.
http://support.apple.com/kb/HT1423#1
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8. 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.
9. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory
correctly.
10. Tuck the tabs above the memory DIMMs, and reinstall the memory access door.
11. Stand the computer in its upright position, reconnect the power cord and all other cables to the computer, then
start the computer.
Back to top
Applicable models
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
These iMac models have these memory specifications:
http://support.apple.com/kb/HT1423#1
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Number of memory slots
2
Base memory
1 GB
Two 512 MB DIMMs; one in each of the memory slots
iMac (Late 2006)
512 MB
One DDR2 SDRAM installed into the top slot
iMac (17-inch Late 2006 CD)
512 MB
Two 256 MB DIMMs; one in each of the memory slots
iMac (Mid 2006)
512 MB
One DDR2 SDRAM installed into the top slot
iMac (Early 2006)
4GB
2 GB SO-DIMM in each of the two slots*
iMac (Late 2006)
2 GB
1 GB SO-DIMM in each of the two slots
iMac (17-inch Late 2006 CD)
Maximum memory
iMac (Early 2006)
Memory card specifications
Compatible:
Not compatible:
- Small Outline Dual Inline Memory Module (DDR SO-DIMM) format
- Registers or buffers
- PC2-5300
- PLLs
- Nonparity
- ECC
- 200-pin
- Parity
- 667 MHz
- EDO RAM
- DDR3 SDRAM
Additional notes
For best performance, fill both memory slots, installing an equal memory module in each slot.
* The computer will only use a maximum of 3 GB of RAM. For more information, refer to iMac (Late
2006): Memory Specifications.
Removing or installing memory
Warning: The internal components of your iMac computer can be warm. If you have been using your iMac
computer, wait ten minutes after shutting down the computer to let the internal components cool before
continuing.
Installing memory in the bottom slot
Important: When installing SDRAM DIMMs into the computer, press the DIMM up into the slot with your thumbs; do
not use the DIMM ejector clips. Trying to push the DIMM into the slot using the ejector clips may damage the
SDRAM DIMM.
To install memory into the bottom RAM slot, follow these instructions:
1. Turn off your computer by choosing the Apple () menu, then Shut Down.
2. Disconnect all cables and the power cord from your iMac.
3. Place a soft, clean towel or cloth on the desk or surface to prevent scratching the LCD display. Hold the sides of
the computer and gently lay the computer face down.
4. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac, as shown below.
5. Remove the access door and set it aside.
6. Move the DIMM ejector clips to their fully open position.
http://support.apple.com/kb/HT1423#1
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7. Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM as
shown.
8. After you insert it, press the DIMM up into the slot with your thumbs. Do not use the DIMM ejector clips to
push in the DIMM. Trying to push the DIMM into the slot using the ejector clips may damage the SDRAM DIMM.
There should be a slight click when you seat the memory fully.
9. Close the ejector clips.
10. Reinstall the memory access door.
11. Lift the iMac back to its normal upright position and reconnect the power cord and all other cables. Your
computer is ready to start up now.
Replacing memory in the top slot
Important: When installing SDRAM DIMMs into the computer, press the DIMM up into the slot with your thumbs; do
not use the DIMM ejector clips. Trying to push the DIMM into the slot using the ejector clips may damage the
SDRAM DIMM.
To replace memory into the top RAM slot:
http://support.apple.com/kb/HT1423#1
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1. Turn off your computer by choosing the Apple () menu, then Shut Down.
2. Disconnect all cables and the power cord from your iMac.
3. Place a soft, clean towel or cloth on the desk or surface to prevent scratching the LCD display. Hold the sides of
the computer and gently lay the computer face down.
4. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac, as shown below.
5. Remove the access door and set it aside.
6. Pull the two levers on each side of the memory compartment to eject the memory module that's already
installed.
7. Remove the memory module from your iMac as shown below.
8. Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM as shown below.
http://support.apple.com/kb/HT1423#1
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9. After you insert it, press the DIMM up into the slot with your thumbs. Do not use the DIMM ejector clips to
push in the DIMM. Trying to push the DIMM into the slot using the ejector clips may damage the SDRAM DIMM.
There should be a slight click when you seat the memory fully.
10. Cose the ejector clips as shown below.
11. Reinstall the memory access door.
12. Lift the iMac back to its normal upright position and reconnect the power cord and all other cables. Your
computer is ready to start up now.
Back to top
Additional Information
Checking that your computer recognizes the new memory
After installing additional memory, you should confirm that the computer recognizes the new memory. To check the
computer’s memory:
1. Start up your computer.
2. When you see the Mac OS X desktop, choose Apple () from the upper-left menu bar, then choose About This
Mac.
The total memory includes the amount of memory that originally came with the computer plus the new memory you
added, or if all the memory has been replaced, the new total for that memory. For detailed information about the
amount of memory installed in your computer, open System Profiler by choosing Apple (), then About This Mac;
click More Info and then Memory from the Hardware section that appears in System Profiler.
If your computer doesn’t recognize the memory or doesn’t start up correctly, confirm that the memory you installed
is compatible with your iMac and that it is installed correctly by reseating the memory.
http://support.apple.com/kb/HT1423#1
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