Owner's Manual

073-1246 Rev. C 4

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

benet 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 dierent-size DIMMs in your computer, follow the order in the tables above. If the

DIMM conguration you install doesn’t provide optimized performance, the Memory Slot Utility

will appear on screen and recommend an improved conguration. To use the Memory Slot

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