Mac_Pro_Early2009_Memory_DIMM_DIY.pdf

 Mac Pro

Memory DIMMs

Replacement Instructions

First Steps

Note: Follow these instructions carefully. Failure to do so could damage your equipment and

void its warranty.

Shut down computer.

2 Wait 10 minutes.

W arning: Parts inside

computer can be very

hot. Allow computer

to cool down before

continuing.

Unplug all external

cables except power

cord.

Touch metal PCI cover

on back of computer.

Unplug power cord.

Opening the

Computer

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.

Remove access panel

and place it on lat

surface covered by

soft, clean cloth.

073-1246 Rev. B 1

Memory

Coniguration

Quad-Core Coniguration

DIMMs reside on the

computer’s processor

board, which is laid out

in two conigurations.

Check the illustrations on

this page to determine if

you have a quad-core or

8-core coniguration.

Speciications

DIMMs for your

computer must it these

speciications:

PC3-8500,1066

•

MHz, DDR3 SDRAM

UDIMMs

72-bit wide, 240-pin

•

modules

18 memory ICs

•

maximum per UDIMM

Error-correcting code

8-Core Coniguration

(ECC)

Note: Memory from older

Apple computers is not

compatible with your

computer.

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

diferent-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.

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

beneit from the larger

amount of memory.

073-1246 Rev. B 3

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

For optimal memory

bandwidth, all six memory

channels should be used,

and memory should be

balanced across the six

channels.

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

Note: Populating slot 4 or

8 slightly drops maximum

memory bandwidth,

but depending on the

applications used, overall

system performance may

beneit from the larger

amount of memory.

Memory Slot Utility

If you install diferent-size DIMMs in your computer, follow the order in the tables above. If the

DIMM coniguration you install doesn’t provide optimized performance, the Memory Slot Utility

will appear on screen and recommend an improved coniguration. To use the Memory Slot

Utility again, go to /System/Library/Core Services.

073-1246 Rev. B 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.

Locate processor tray.

2 Press down and

release 2 latches on

front of processor tray.

073-1246 Rev. B 5

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