Like 600R said, you really have to be 100% sure that your 3DFX drivers are fully removed. Cos that can wreak havoc with your performance.
Also make sure that your bios is properly set up for your GTS.
Video shadow: Disabled
Palette snoop: Disabled
Video Cacheable: Disabled
Video Ram Cacheable: Disabled
Make you have 'assign irq to VGA' enabled
In windows make sure that your GTS does not share its irq with any other card/device.
A lot of people are finding the 6.49 drivers the best.
Make sure that 3dMark is running Hardware T&L.
EDIT BIT: Flash your bios as a LAST RESORT, if it goes wrong then your screwed.
P3 800e @ 1 Gig with Alpha PEP66 (YS-Tech fan: bloody noisy)
256M PC133 Crucial
TurtleBeach Santa Cruz
Iiyama VisionMaster Pro450
[This message has been edited by Gasman (edited 01-08-2001).]
Corsair PC2700 cas2