Owner's Manual

073-1246 Rev. C 3
© 2009, 2010 Apple Inc. All rights reserved.
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
dierent-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.
Note: Populating slot 4
slightly drops maximum
memory bandwidth,
but depending on the
applications used, overall
system performance may
benet from the larger
amount of memory.
If you have Fill these slots
Two DIMMs 1 and 2
Three DIMMs 1, 2, and 3
Four DIMMs 1, 2, 3, and 4