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
P6 chip. Triple the speed of the Pentium.
Tualatin: PIII-S @ 1628 MHz | QDI Advance 12T | 2GB DDR-310 | 6800GT | X-Fi | 500GB HDD | 3DMark01: 14,059
Dothan: PM @ 2720 MHz | MSI Speedster FA4 | 2GB DDR2-544 | GTX-280 | X-Fi | 500GB SSD | 3DMark01: 42,148