Apple Mac Pro (Early 2008) - Manual (Page 43)

Chapter 3 Making a Good Thing Better 43
Installing Memory
Your Mac Pro has two memory cards with four memory slots on each card (in four
banks of two each). Your Mac Pro comes with a minimum of 2 GB of memory, installed
as a pair of 1 GB fully buffered dual inline memory modules (FB-DIMMs) in two of the
DIMM slots. You can install additional pairs of 1 GB, 2 GB, or 4 GB FB-DIMMs in the open
DIMM slots on the memory cards, for a total of 32 GB of memory.
DIMMs must be installed in matched pairs and fit these specifications:
 800 MHz, DDR2, FB-DIMMs
 72-bit wide, 240-pin modules
 36 memory ICs maximum per DIMM
 Error-correcting code (ECC)
Important: Apple recommends that you use Apple-approved FB-DIMMs. Other
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.