With A7M266 and Tbird C, 512 megs Crucial/Corsair pc2100, no problems with sb sound or usb. But still getting chronic crashes with GF2 GTS in Win2k -- was pretty stable with SP1, but I reinstalled SP2 so many times, trying to get it straightened out, that the last reversion to SP1 didn't make much difference. Now debating whether to try clean reinstallation with SP1 or SP2 first. Bios tweaks seem to make no great diff.