With the exception of 3D Mark 99, the Celeron running at 605Mhz went toe to toe with the Pentium 3 at 620Mhz. This I'm sure we can all live with since we play games and not benchmarks. However the 3D Mark score does go to show the potential increase in performance by having the SSE instruction set. Unreal ran faster on the Pentium 3 because the game codes of more tuned for Pentium than Celerons.