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32 Chapter 3 Working Inside Your Computer
Installing Memory
Your Mac Pro has two memory cards with 4 memory slots on each card (in four banks
of two each). Your Mac Pro comes with a minimum of 1 GB of memory, installed as a
pair of 512 MB fully buffered dual inline memory modules (FB-DIMMs) in two of the
DIMM slots. You can install additional pairs of 512 MB, 1 GB, or 2 GB FB-DIMMS in the
open DIMM slots on the memory cards.
DIMMs must be installed in equal-sized pairs and fit these specifications:
 667 MHz, FB-DIMMS
 72-bit wide, 240-pin modules
 36 devices maximum per DIMM
 Error-correcting code (ECC)
Important: Apple recommends that you use Apple-approved FB-DIMMS. Non Apple-
approved FB-DIMMS may cause your Mac Pro to operate louder or decrease
performance to conserve heat. DIMMs from older Mac computers cannot be used in
your Mac Pro.
Note: When purchasing DIMMs for use in Mac computers, make sure that the memory
vendor conforms to the Joint Electron Device Engineering Council (JEDEC)
specification. Check with your memory vendor to ensure that the DIMMs support the
correct timing modes and that the Serial Presence Detect (SPD) feature has been
programmed properly, as described in the JEDEC specification. To check the
compatibility of your DIMMs, see the Macintosh Products Guide on Apple’s website at
www.apple.com/guide. You can purchase Apple-branded memory online from the
Apple Store at www.apple.com/store.