OK, so I finally swapped out the ATI Rage 128 in my 466MHz Digital Audio Power Mac G4 for the Radeon 9600 XT that came with my G5 tower. I had to disable pins 3 and 11 on the card otherwise the Mac wouldn't even power on, I used an X-ACTO knife to scratch away at the solder lines connecting the pins to their resistors (R15 and R60.) Specs: -466Mhz G4 (7400) -1.5GB memory -80GB, 7,200 rpm hard disk on IDE -Mac OS X 10.5.8, Leopard -2048x1152 display, connected via VGA Anyway, the only benchmark I could run was the original, software rendering only version of Quake. OS X version 1.10 that is. I specified it using the command line to allocate up to 384MB of memory to the game if needed. Screen was running at 1600x900, the highest the ATI Rage card could display properly, scaled up to fill out all 2048x1152 pixels on my screen. Ran it at 1280x720 first up. Scored 24.2 fps. OpenGL accelerated Quake did not launch, gave a pixelformat error. Swapped out the cards. Used a DVI to VGA adapter to connect the Radeon card. Set display resolution to fill the screen at 1600x900. Ran the same timedemo at 1280x720. Scored... 18.0 fps. What? I got a score of 17.4 when running it at 1280x720 with the actual system display set (in Display Preferences) to the native 2048x1152. I then ran the timedemo in the OpenGL accelerated build of Quake. Scored 59.4 fps. Perfectly buttery smooth. I think it would have played through faster but VSync may have been on or something... more tests to follow. Whole UI of OS X is much smoother, also. Awesome upgrade!