Apple Memory DIMMs User Manual
Memory DIMMs
Replacement Instructions
Mac Pro
First Steps
Shut down computer.1
Wait 10 minutes.
2
Warning: Parts inside
computer can be very
hot. Allow computer
to cool down before
continuing.
Unplug all external 3
cables except power
cord.
Touch metal PCI cover 4
on back of computer.
Unplug power cord.5
Note: Follow these instructions carefully. Failure to do so could damage your equipment and
void its warranty.
Opening the
Computer
Hold side access 1
panel and lift latch on
back of computer.
Warning: Edges of
access panel and
enclosure can be
sharp. Be careful
when handling.
Remove access panel 2
and place it on at
surface covered by
soft, clean cloth.
© 2009 Apple Inc. All rights reserved.
073-1246 Rev. B 1
Memory
Conguration
DIMMs reside on the
computer’s processor
board, which is laid out
in two congurations.
Check the illustrations on
this page to determine if
you have a quad-core or
8-core conguration.
Specications
DIMMs for your
computer must t these
specications:
PC3-8500,1066 •
MHz, DDR3 SDRAM
UDIMMs
72-bit wide, 240-pin •
modules
18 memory ICs •
maximum per UDIMM
Error-correcting code •
(ECC)
Quad-Core Conguration
8-Core Conguration
Note: Memory from older
Apple computers is not
compatible with your
computer.
© 2009 Apple Inc. All rights reserved.
073-1246 Rev. B 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
dierent-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 optimal memory
bandwidth, all three
memory channels should
be used, and memory
should be balanced across
the three channels.
Note: Populating slot 4
slightly drops maximum
memory bandwidth,
but depending on the
applications used, overall
system performance may
benet from the larger
amount of memory.
© 2009 Apple Inc. All rights reserved.
If you have Fill these slots
Two DIMMs 1 and 2
Three DIMMs 1, 2, and 3
Four DIMMs 1, 2, 3, and 4
073-1246 Rev. B 3
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