The GeForce 6800 GS, GeForce 6800 GT, RADEON X1600 XT and RADEON X800 XL have similar speeds in all resolutions, with minor deviations. The RADEON X1600 XT stands out in low resolutions – it is not limited by its four TMUs in this small-scale scene with numerous special effects.
The GeForce 6800 GS leaves its predecessor behind in higher resolutions of the third test at the “pure speed” settings. When FSAA and anisotropic filtering are enabled, the situation changes to the opposite in 1280x1024, but then the newer card is ahead again in 1600x1200. Both RADEONs can compete with the GeForce 6800 GT and GS in the “pure speed” mode only.
So, the resulting scores are appropriate: the GeForce 6800 GS is really better than the GeForce 6800 GT and can rival the RADEON X1600 XT in the “pure speed” mode. At the “eye candy” settings, however, the new graphics card from ATI loses its ground, limited by its four TMUs and, probably, non-optimized drivers.