I'll show you examples of it running over multiple cores. There is a reason I set it to run on one core, makes it slightly better (running it over 2 cores can be better than one).
For example, when running UT2k4 over 4 cores, I got an average FPS of 3-7FPS. Over 2 cores I got around 105FPS avg, and on one core, I got around 225FPS avg. I can repeat that also if desired.
I'll also mention that I got this computer 2-3 weeks ago, after Intel dropped the Q6600 prices. And the overclock added to the 'value'. Just wait when I get a new HSF!
As for this test being based on Raw MHz..... not quite. Find someone with a Pent D with a higher clock speed than me, they won't beat my time. This test is based on the efficiency of the processor. Performance per clock, also the bandwidth between the CPU and RAM. Also lower timings can yield better times.
I'll show you soon that Vista isn't too bad. It is slower, but only by a few seconds.