> the apparent hardware problem found in 9800 series cards

Reading bigfoot's posting I think it's not quite clear whether the root of the problem is in the R350 chip of the 9800 series cards or in the AGP controller of the CPC925/U3 northbridge chip in the PowerMac G5. He just says there's an incompatibility, which I'd say leaves either possibility. After all, the Radeon 9800 series cards seem to work fine in the PowerMac G4 with AGP transfers enabled.