Originally posted by: the Chase
If you are going to keep the card for a long time I'd say pay the extra $20 for the 6800GS or go with the GTO2 which will def. unlock and be faster than the GS(but no shader model 3 if that matters to you).
The C3D won't unlock for sure, especially with the new batch. And both the 6800GS and x800GTO are monster overclockers in general, regardless of make / brand.
The 6800GS has SM3.0, has SLi easily, and takes a lesser hit with HDR.
The x800GTO might unlock, will be harder to crossfire with another x800gto if unlocked, doesn't support SM3.0, takes a hard hit with HDR, can't even PLAY Far Cry with HDR, but will / can generally be faster than the 6800GS if unlocked / overclocked HARD.
If you get lucky with both cards, it's basically comparing a ~6800ultra and an ~x850xt.