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Mac Pro
Memory DIMMs
Replacement Instructions
Note: Follow these instructions carefully. Failure to do so could damage your equipment and
First Steps
void its warranty.
1 Shut down computer.
2 Wait 10 minutes.
Warning: Parts inside
computer can be very
hot. Allow computer
to cool down before
continuing.
3 Unplug all external
cables except power
cord.
4 Touch metal PCI cover
on back of computer.
5 Unplug power cord.
Opening the
Computer
1 Hold side access
panel and lift latch on
back
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Memory Quad-Core Configuration Configuration DIMMs reside on the computer’s processor board, which is laid out in two configurations. Check the illustrations on this page to determine if you have a quad-core or 8-core configuration. Specifications DIMMs for your computer must fit these specifications: • PC3-8500,1066 MHz, DDR3 SDRAM UDIMMs • 72-bit wide, 240-pin modules • 18 memory ICs maximum per UDIMM 8-Core Configuration • Error-correcting code (ECC) Note: Memory from older A
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Filling Slots If you are installing DIMMs that are of the same size, follow the order in the tables on pages 3 and 4. If you are installing different-size DIMMs, also refer to “Memory Slot Utility” on page 4. Quad-Core Memory Quad-core computers have four memory slots. You can install 1 GB or 2 GB DIMMs for a total of up to 8 GB of memory. The processor’s memory controller has three memory channels. DIMM slots 1 and 2 have their own channels; slots 3 and 4 share a channel. For
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8-Core Memory Eight-core computers have eight memory slots, four per processor. You can install 1 GB, 2 GB, or 4 GB DIMMs for a total of up to 32 GB of memory. Each processor’s memory controller has three memory channels. DIMM slots 1, 2, 5, and 6 have their own channels; slots 3 and 4 share a channel and slots 7 and 8 share a channel. If you have Fill in these slots Two DIMMs 1 and 2 For optimal memory Three DIMMs 1, 2, and 3 bandwidth, all six memory Four DIMMs 1, 2, and 5, 6 c
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Removing the Installed DIMM Because memory DIMMs are installed on the computer’s processor board, before you can remove a DIMM, you must remove the processor tray. 1 Locate processor tray. 2 Press down and release 2 latches on front of processor tray. © 2009 Apple Inc. All rights reserved. 073-1246 Rev. B 5
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3 Holding tray by latches, lift it out of computer. 4 Place tray DIMM side up on soft, clean cloth. Important: When removing or installing DIMM, be careful of nearby heatsink fins, as they can be sharp. Always handle DIMM only by the edges. Do not touch its connectors or any components. 5 Open ejectors on DIMM slot by pushing them out to the sides. 6 Holding DIMM by edges, remove it from processor board. © 2009 Apple Inc. All rights reserved. 073-1246 Rev. B 6
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Installing the Replacement DIMM 1 Align DIMM in slot on processor board. 2 Push both ends of DIMM down until ejectors snap back up into place. Note: If a black sticker covers barcode label on DIMM you are replacing, remove sticker before returning DIMM to Apple. (Service DIMMs do not include black sticker.) 3 Holding processor tray by latches, lower it back into computer. 4 Make sure latches are closed flush with front of processor tray. © 2009 Apple Inc. All rights reserved. 073
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Closing the Computer 1 Replace access panel. Note: Make sure latch is up before you replace panel. If latch is down, panel will not seat correctly. 2 Push latch down to close and secure access panel. Warning: Never turn on computer unless all its internal and external parts are in place and it is closed. Operating computer when open or missing parts can cause damage or injury. 3 Verify DIMM installation using “Memory Diagnostic LEDs” information on next page. © 2009 Apple Inc.
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Memory Diagnostic LEDs Important: The quad- Quad-Core LEDs core and 8-core processor boards include a set of diagnostic memory LEDs. After re-installing or replacing a DIMM, always use the LEDs to verify the DIMM is correctly seated. To verify your DIMM installation, do this: 1 Start up the computer. 2 Remove the side access panel. 3 Check the bank of 8-Core LEDs memory LEDs. An illuminated, red LED indicates its associated DIMM may be poorly seated or failed. 4 If you see a red
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How to Troubleshoot Follow this procedure when troubleshooting each DIMM identified by a red LED: Memory LEDs 1. Remove and reseat DIMM. 2. Restart computer. If associated LED is no longer illuminated, issue is resolved. 3. If associated LED remains illuminated, replace DIMM with new DIMM. 4. Restart computer and verify LED is no longer illuminated. There is one exception. If two LEDs illuminate at the same time for the 3 DIMM and 4 DIMM slots or for the 7 DIMM and 8 DIMM slots, check both D
