Re: GTX 6800 Overclocking
I have settled at 1245/6966 in games, which is +121 core, +480 mem and 132% power target.
I've seen people have to get +150 or more to get close to mid 1200s, it all depends what your boost clock is...mine is 1124.
I made a custom fan cure and I never see it go higher than 65c, these cards are awesome once you figure them out, they run so quiet even with the fan at max.
I'd say go as high as you can..get the most out of your card. BF3 seems to be one of the best ways to test at the moment, if its stable in BF3 then your good to go.