are you overclocking at all? if so are you oc'ing the cpu or your gfx card...
I got stuttering and artefacting on my 6600GT when I pushed the core speed upto 570mhz and the mem speed upto 1400mhz... Now I just run it at 500mhz core and 1120mhz mem and its sweet as... just a bit hot!
But if you are oclocking your cpu... make sure you have locked the agp as you could be ocing this at the same time by accident and this can cause the problems you are experiencing.
If you arent oc'ing... what are your system temps like?
does your 6800GT take an extra power plug? have you pluged it in? are you running other programs at the same time? have you checked for conflicting IRQs?
I got stuttering and artefacting on my 6600GT when I pushed the core speed upto 570mhz and the mem speed upto 1400mhz... Now I just run it at 500mhz core and 1120mhz mem and its sweet as... just a bit hot!
But if you are oclocking your cpu... make sure you have locked the agp as you could be ocing this at the same time by accident and this can cause the problems you are experiencing.
If you arent oc'ing... what are your system temps like?
does your 6800GT take an extra power plug? have you pluged it in? are you running other programs at the same time? have you checked for conflicting IRQs?