Intel benchmarked a Core 2 Duo based system at Computex, comparing it against a system with an AMD Athlon FX processor.
What is extremely interesting about this set of gaming benchmarks is that Intel not only compared them on “identical” platforms, but also at identical clock speeds. Both the AMD FX and Intel processors were clocked at 2.6GHz. The AMD machine scored 138 frames per second while the Intel Core 3 Duo machine returned a whopping 177 frames per second. A full 39 fps better comes out to over a 25% increase in gaming performance clock per clock.
You can check it out over here. There are also a couple of benchmarks which show the 2.93GHz Core 2 Duo performs roughly 50% better in games than the 3.73GHz Pentium EE 965.