Apple MB871LL User Manual - Page 41
Installing Memory, vendor conforms to the Joint Electron Device Engineering Council JEDEC
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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 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. 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. Chapter 3 Making a Good Thing Better 41
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