Service Source Power Mac G5 - Retrocomputing.net

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.
To determine the types of DIMMs to install, refer to the table below:
DIMM Slots DIMM speed Maximum amount
4 333 MHz, PC 2700 up to 4 GB
8 400 MHz, PC 3200 up to 8 GB
18 - Power Mac G5 Take Apart Memory (DIMMs)