GeForce 6800 series round-up: Five of the best compared
 

CHOOSING A NEXT-GEN graphics card is tough. First, one has to decide between ATI's Radeon X800 family and NVIDIA's GeForce 6800 series. That decision alone is a daunting one, requiring one to weigh DOOM 3 performance, potential Half-Life 2 performance, the merits of NVIDIA's Shader Model 3.0 implementation, and ATI's stellar performance in current DirectX 9 applications. There's also the religion factor. These days, choosing between ATI and NVIDIA is like declaring a religious affiliation, and there's plenty of rabid preaching on both sides of the fence.

http://techreport.com/reviews/2004q3...o/index.x?pg=1

In testing, I was able to get the following core and memory clock speeds from each card:

e-GeForce 6800 Ultra - 464/1180MHz
BFG GeForce 6800 GT OC - 439/1130MHz
PNY GeForce 6800 GT - 421/1140MHz
Chaintech AA6800 - 380/811MHz
inno3D GeForce 6800 - 375/798MHz