Q. What RAM memory and Hard drives fit my Apple PowerMac G5?

There have been two major models of PowerMac G5, the change over from PCI-X to PCI-e slots, and from Dual processors to Dual-Core single processor was made in October 2005. With this change, PCI and PCI-X interface cards from the earlier G5 models no longer fit the new PCI-e based G5s.  At the same time, the RAM configuration was changed from DDR (PC3200) to DDR2 (PC2-4200).

Because there is an overlap in the speeds of the two lines, you must check your Apple Menu: About this Mac information to verify which model it is before ordering components.  The main screen will tell you the RAM speed, and the More Information… Hardware screen will tell you the Mac Identifier number.

Lists of RAM and drive compatibility for all Macs