AMD R600g Performance Patches Yield Mixed Results
But for the Reaction game, surprisingly, in this hardware/software configuration there wasn't any huge boost for the HD 4650.
Smokin Guns, another ioquake3-based game, saw boosts in its frame-rate at both 1280 x 1024 and 1920 x 1080. However, the frame-rate was only up by about 30%.