Apple Mac Pro (Early 2009) - Manual (Page 41)

Chapter 3 Making a Good Thing Better 41
Installing Memory
Your Mac Pro comes with 3 or 6 GB of memory, installed as 1 GB unbuffered dual inline
memory modules (UDIMMs).
All installed UDIMMs must meet these specifications:
 PC3-8500, 1066 MHz, DDR3 SDRAM UDIMMs
 Error-correcting code (ECC)
 72-bit wide, 240-pin ECC modules
 36 ICs maximum per ECC UDIMM
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.
NOTICE: Apple recommends that you use Apple-approved DIMMs. DIMMs from older
Mac computers cannot be used in your Mac Pro. You can purchase Apple-branded
memory online from the Apple Store at www.apple.com/store.