Specifications

4 - Power Mac G5 Basics
What’s New
DDR Memory
Depending on the model, Power Mac G5 computers have either four or eight Dual Inline
Memory Module (DIMM) slots for Double-Data-Rate (DDR) Synchronous Dynamic
Random-Access Memory (SDRAM) devices. The computers ship with a minimum of 256
MB of RAM, installed as a pair of 128 MB DIMMs in two of the DIMM slots. You can install
additional DIMMs, provided they are installed in pairs of equal size. A diagram marked on
the logic board near the slots illustrates how the pairs must be installed.
To determine the types of DIMMs to install, refer to the table below:
DIMM Slots DIMM speed Maximum amount
4 (two banks of 2 slots) 333 MHz, PC 2700 up to 4 GB
8 (two banks of 4 slots) 400 MHz, PC 3200 up to 8 GB
In addition, DIMMs must fit these specifications:
• 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)