3DMark03
3DMark03 to start us off.3DMark03
Vendor: Futuremark - (Website)API: DirectX 9.0
Pixel Shader Version Supported: Mix PS1.1, PS1.4, PS2.0

Fillrate and shading power translates well into the graph you see above. A 6600 GT's faster core and memory clocks allow it to keep a small lead at every resolution. Having an extra 128MB of onboard RAM doesn't make a real difference when tested without AntiAliasing and Anisotropic Filtering.

Having added them in, though, we see that the 256MB-equipped RX700PRO closes the gap right up at 1280x1024 and 1600x1200. Of course, having a 256MB 6600 GT would change the picture. The vanilla 6600, held back by relatively low core and memory clocks of 325MHz/550MHz, respectively, is firmly in third place.