I'm using a Tyan Tiger 133 1834. I don't have any problems with my Radeon 64 VIVO now that I've installe the new 4in1 VIA drivers (turbo mode). I still have one game that runs slow. Comanche vs Hokum. Oh, and Longbow Digital Arts Particle Fire 2. Both run very slow. Other than those, all other are FAST FAST FAST!