I also installed W-XP with newest drivers ofcourse.
My sytem is:
p41700Mhz
256MB RDRAM 800Mhz
GF2 ULTRA 64MB
SBLIVE!
and performance AFTER moving from W98 to WXP is really poor. OFP strangely stucks every second, not full stop (which is fixed with taking alternative cache away from detonator settings) but really annoying anyway...
Don't know how to fix it; waiting for another OFP patch / WXP servicepack... perhaps I'll move to W2000, it seems to work without problems on W2000.