Memory DIMMs

Power Mac G5 (Late 2004) computers have four Dual Inline Memory Module (DIMM) slots. Each slot accepts 400 Mhz Double-Data-Rate (DDR) Synchronous Dynamic Random-Access Memory (SDRAM) devices.

The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB DIMMs installed in the two DIMM slots marked "1." You can add DIMMs, provided they are installed as a pair of equal size, in the two DIMM slots marked "2." A diagram on the logic board near the DIMM slots illustrates how the pairs must be installed.

DIMMs must fit these specifications:

  • 400 MHz DDR
  • 2.5 volt
  • 184-pin module
  • Maximum number of memory devices on DDR SDRAM:16.
  • Nonparity
  • No error correcting codes (ECC)
  • Unbuffered (registered or buffered DDR SDRAM cannot be used)

Important: Always install DIMMs in pairs of equal size. Memory from older Macintosh computers is not compatible with the Power Mac G5. Do not use older memory, even if it fits into the DIMM slots.

No tools are required for this procedure.

Preliminary Steps

Before you begin, open the computer, and lay it on its side with the access side facing up.

Part Location

Tools

Procedure

  1. Locate the DIMM slots on the logic board.
  2. Open the ejectors on the DIMM slot by pushing them out to the sides.
  3. Holding the DIMM by both top corners, lift it straight up out of the computer.

Replacement Note: Align the DIMM in the slot and push both ends of the DIMM down until the tabs are vertical and the ejectors snap into place.

Important: Do not touch the DIMM connectors. Handle the DIMM only by the edges. Memory (DIMMs) Power Mac G5 (Late 2004) Take Apart - 20

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