Call of Duty, Serious Sam: SE
Call of Duty
It's at the upper setting that things get interesting, with the GT asking questions of the Ultra, the X800 XT PE just keeping up due to raw power and the X800 PRO dropping off. ATI's OpenGL performance isn't stellar, so it's a graph that could have mostly been predicted before hand with a little thought.
It's the plain 6800's curious performance at the upper setting that stands out the most. It seems like the 128MB board has a hard time, with the 6800's drivers seemingly not optimised for the texture overflow case in OpenGL.
Serious Sam: SE
The Serious Sam case is much the same. OpenGL-based, all three 6-series boards are able to eclipse even the XT PE at 1600x1200. Discarding the X800 PRO's 9800XT-like performance in Serious Sam and the middling OpenGL performance from the X800 XT PE, you can clearly see the inter-series scaling from the 6-series boards.
