Today I slotted a "new" 512MB Quadro FX 4500 in my Quad G5 and did some benchmarking with Quake 3, Quake 4, Doom 3, UT2004, and Prey. This card replaced a 256MB X1900XT and so far I'm really pleased with it. It's a heck of a lot quieter, that's for sure!
Quake 3 absolutely flies on a G5. Memory latency on these machines is just dreadful, but man does that 1.25GHz FSB give it a ton of raw bandwidth. Say, doesn't that remind you of some other CPU/memory combination? 😜
PowerMac G5 Quad: 2x dual-core PowerPC 970MPs at 2.5GHz, 16 GB DDR2-533, Quadro FX 4500 PCIe, OS X 10.5.8
1024x768, everything maxed: 520.9 FPS
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"A little sign-in here, a touch of WiFi there..."