LH Memory DIMMs

Depending on the model, Power Mac G5 computers have either four or eight Dual Inline Memory Module (DIMM) slots arranged in two banks. The slots accept 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 slot 1 of each DIMM bank. You can add DIMMs, provided they are installed in pairs of equal size, one per bank, from the center outward. A diagram marked on the logic board near the DIMM slots illustrates how the pairs must be installed.

Types Dimms

To determine the types of DIMMs to install, refer to the table below: DIMM Slots DIMM speed Maximum amount

In addition, DIMMs must fit these specifications:

  • 2.5 volt
  • 84-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, lay it on its side with the access side facing up, and remove the front inlet fan assembly.

Part Location


Apple Power Mac Ram Install Diagram


  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.

Exploded Powermac

Important: Do not touch the DIMM connectors. Handle the DIMM only by the edges.

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