Here's your first PowerPC result!
PowerMac G4 MDD, dual G4 1.25GHz (166MHz FSB, 256K on-die L2 cache, 2MB external L3 cache per CPU), 2GB PC2700 DDR, GeForce 7800GS AGP, OS X 10.4.11
1024x768, all maxed.
Well, the G4 sure sucked at Doom3, but Quake 3 is a completely different story! 227 fps from a mere 1.25GHz is nothing short of amazing. I'm starting to think that Doom 3 was just a crappy/lazy port.
Ten Gigahertz
5 Groovy GHz: Ryzen 9 5900X | GTX 1080 Ti | 64GB DDR4-3600 | 2TB NVMe, 8TB HDD | Win 10
5 Troll GHz: AMD FX-8350 | Radeon R9 Fury | 16GB DDR3-1866 | 500GB SSD, 2TB HDD | Win 8.1