ATI has Radeon 9200 drivers for Mac OS 9.2.2 for their PCI card, of course. I suspect they will work with flashed AGP cards, but I don't know from experience. The Radeon 8500 and 9000 should work fine in 9.2.2 with Apple's ATI drivers.
It is really unlikely that you'll see all the benefit of a 9600 or 9800 on a QuickSilver, anyway. The bottlenecks there will likely be in the CPU, not the video card. So the higher-end stock cards (GeForce 4MX, etc) are a pretty good match for whatever you are likely to want to do on a QuickSilver anyway. I'd stay away from the GeForce 2MX, though. And the Radeon 7500 seems to perform about as well as the GF4MX.
Peace,
Drew
_________________
Power to the PowerPC!
It is really unlikely that you'll see all the benefit of a 9600 or 9800 on a QuickSilver, anyway. The bottlenecks there will likely be in the CPU, not the video card. So the higher-end stock cards (GeForce 4MX, etc) are a pretty good match for whatever you are likely to want to do on a QuickSilver anyway. I'd stay away from the GeForce 2MX, though. And the Radeon 7500 seems to perform about as well as the GF4MX.
Peace,
Drew
_________________
Power to the PowerPC!