When running the R300 Gallium3D driver with Mesa 8.0 and 8.1-devel, the upcoming Mesa release appears to be slightly slower for the X1800XL and X1950PRO graphics cards.
Meanwhile for Lightsmark, the R300g driver on Mesa 8.1 scratches into slightly faster territory.
Nexuiz is still far too slow at 1920 x 1080 for these old ATI Radeon GPUs.