Apple MA970LL User Manual - Page 43
Installing Memory, vendor conforms to the Joint Electron Device Engineering Council JEDEC
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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. Chapter 3 Making a Good Thing Better 43