Memory DIMMs

Memory DIMMs
 Mac Pro
Memory DIMMs
Replacement Instructions
First Steps
1
Shut down computer.
2
Wait 10 minutes.
Note: Follow these instructions carefully. Failure to do so could damage your equipment and
void its warranty.
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 of computer.
Warning: Edges of
access panel and
enclosure can be
sharp. Be careful
when handling.
2
Remove access panel
and place it on flat
surface covered by
soft, clean cloth.
© 2009, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 1
Memory
Configuration
Single-Processor 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 single- or dualprocessor configuration.
Specifications
DIMMs for Mac Pro (Early
2009) must fit these
specifications:
• PC3-8500,1066
MHz, DDR3 SDRAM
UDIMMs
• Error-correcting code
(ECC)
• 72-bit wide, 240-pin
ECC modules
• 18 memory ICs
maximum per UDIMM
Dual-Processor Configuration
DIMMs for Mac Pro (Mid
2010) must fit these
specifications:
• PC3-10600E,1333
MHz, DDR3 SDRAM
UDIMMs
• Error-correcting code
(ECC)
• 72-bit wide, 240-pin
ECC modules
• 36 memory ICs
maximum per UDIMM
Note: Memory from older
Apple computers is not
compatible with your
computer.
© 2009, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 2
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.
Single-Processor
Memory
Single-processor
computers have four
memory slots. Depending
on the model, you can
install 1 GB, 2 GB DIMMs,
or 4 GB DIMMs.
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 optimal memory
bandwidth, all three
memory channels should
be used, and memory
should be balanced across
the three channels.
If you have
Fill these slots
Two DIMMs
1 and 2
Three DIMMs
1, 2, and 3
Four DIMMs
1, 2, 3, and 4
Note: Populating slot 4
slightly drops maximum
memory bandwidth,
but depending on the
applications used, overall
system performance may
benefit from the larger
amount of memory.
© 2009, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 3
Dual-Processor
Memory
Dual-processor computers
have eight memory slots,
four per processor. You
can install 1 GB, 2 GB, or 4
GB DIMMs.
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.
For optimal memory
bandwidth, all six memory
channels should be used,
and memory should be
balanced across the six
channels.
Note: Populating slot 4 or
8 slightly drops maximum
memory bandwidth,
but depending on the
applications used, overall
system performance may
benefit from the larger
amount of memory.
Memory Slot Utility
If you have
Fill in these slots
Two DIMMs
1 and 2
Three DIMMs
1, 2, and 3
Four DIMMs
1, 2, and 5, 6
Six DIMMs
1, 2, 3 and 5, 6, 7
Eight DIMMs
1, 2, 3, 4 and 5, 6, 7, 8
If you install different-size DIMMs in your computer, follow the order in the tables above. If the
DIMM configuration you install doesn’t provide optimized performance, the Memory Slot Utility
will appear on screen and recommend an improved configuration. To use the Memory Slot
Utility again, go to /System/Library/Core Services.
© 2009, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 4
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, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 5
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, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 6
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, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 7
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, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 8
Memory
Diagnostic LEDs
Important: The singleand dual-processor boards
include a set of diagnostic
memory LEDs. After reinstalling or replacing
a DIMM, always use the
LEDs to verify the DIMM is
correctly seated.
Single-Processor LEDs
To verify your DIMM
installation, do this:
1
Start up the
computer.
2
Remove the side
access panel.
3
Check the bank of
memory LEDs.
Dual-Processor LEDs
An illuminated, red
LED indicates its
associated DIMM may
be poorly seated or
failed.
4
If you see a red
LED, refer to “How
to Troubleshoot
Memory LEDs” on the
next page.
Note: Apple System
Profiler does not report
unseated or failed
memory. You must use the
memory LEDs to locate
DIMM issues.
© 2009, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 9
How to
Troubleshoot
Memory LEDs
Follow this procedure when troubleshooting each DIMM identified by a red LED:
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 DIMMs using this process:
Check
Result
Action
1. Remove both DIMMs identified by
illuminated LEDs. Set DIMM 4 (or
DIMM 8) aside, and reseat DIMM 3 (or
DIMM 7). Restart computer. Is DIMM 3
(or DIMM 7) LED illuminated?
Yes
Replace DIMM 3 (or DIMM 7) with
new DIMM. Go to step 2.
No
Go to step 2.
2. Reinstall DIMM 4 (or DIMM 8). Restart
computer. Is one or both LEDs
illuminated?
Yes
Replace DIMM 4 (or DIMM 8) with
new DIMM.
No
Issue resolved.
 Apple Inc.
© 2009, 2010 Apple Inc. All rights reserved.
This document is protected under U.S. Copyright Law and International Treaties, and no part of this
document may be reproduced in any form without written permission from Apple.
Apple is not responsible for typographical, printing, or inadvertent errors.
Apple Inc.
1 Infinite Loop
Cupertino, CA 95014-2084 USA
+ 1 408 996 1010
www.apple.com
Apple, the Apple logo, and Mac are trademarks of Apple Inc., registered in the U.S. and other countries.
© 2009, 2010 Apple Inc. All rights reserved.
073-1246 Rev. C 10
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