General Information

The Mac Pro (Early 2008) computer has two memory riser cards with a total of 8 memory slots. On each card, the slots are arranged as two banks of two slots each. The computer 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. Additional pairs of 1 GB, 2 GB, or 4 GB FB-DIMMs can be installed in the open DIMM slots, for a maximum of 32 GB of memory.

It's important to install FB-DIMMs in matched pairs of equal size and equal specification. Use the table and graphic below as guidelines for DIMM placement.

Move one DIMM from bottom card to top card

First pair of additional DIMMs

Top memory card

Move one DIMM from bottom card to top card

Bottom memory card

Bottom memory card

FB-DIMM Placement

If you have

Install DIMMs in these slots*

2 DIMMs

(standard configuration)

1 DIMM on the top memory card in slot 1, and 1 DIMM on the bottom card in slot 1

4 DIMMs

2 DIMMs on the top memory card in slots 1 and 2 and 2 DIMMs on the botom card in slots 1 and 2

6 DIMMs

4 DIMMs on the top memory card in slots 1-4 and 2 DIMMs on the bottom card in slots 1 and 2

8 DIMMs

4 DIMMs on the top memory card in slots 1-4 and 4 DIMMs on the bottom card in slots 1-4

  • Note: Slots are numbered 1-4; slot 1 is the slot closest to the memory card's gold connectors.
  • Note: Slots are numbered 1-4; slot 1 is the slot closest to the memory card's gold connectors.

DIMMs for Mac Pro (Early 2008) must fit these specifications:

  • 800 MHz, DDR2, FB-DIMMs
  • 72-bit wide, 240-pin modules
  • 36 memory ICs maximum per DIMM
  • Error-correcting code (ECC)

Memory from older Macintosh computers is not compatible with Mac Pro (Early 2008).

Important: For proper operation of Mac Pro (Early 2008) computers, Apple recommends using only Apple-approved Mac Pro (Early 2008) FB-DIMMs. Refer to GSX for Apple FB-DIMMs service part numbers.

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