Interesting. AGP is not affected at all? I've done many benchmarks of various Voodoo cards (mainly Napalm- and Avenger-based) under Windows XP and never noticed problems like this. Maybe the NT code base or even SFFT's hard work in the following years brought the solution for this behaviour. Could you verify this with Windows XP and a more recent driver? Unfortunately, I don't have access to any of my Retro rigs at the moment.