Then there's the question of whether it would run at 2.5 GHz. Assuming the 2.5 GHz CPUs were running at full speed, this bottleneck would make the upgraded machine slower than a true 2.5 GHz dual-core Power Mac G5. My guess is that while it may be possible to swap this CPU into a slower (2.0 or 2.3 GHz) Power Mac G5, the memory bus would not run any faster. The G5 Power Macs were all designed so that the memory bus ran at one-third (in some low-end models) or one-half of CPU speed, and the last generation dual-core Power Macs had a different architecture than previous G5 Power Macs. It seems someone had a 2.5 GHz dual-core G5 module for sale on eBay. I received an email wondering whether it's possible to upgrade the CPU in a Power Mac G5.
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