Highly doubt a consumer preview will give you a boost in performance from games, you're probably just thinking it because it's all brand new and sparkly.
Unless we see actual benchmarks, I call bull.
Then you can just leave this thread. I have a reputation as a good member of this site, I wouldn't lie, and since I upgraded from Windows 7, I no longer can do FRAPS on Windows 7 for the benchmarks.
I didn't think I'd need to proove myself on a website where I'm already known to be honest and not lie.
As for how I do know how much of an improovement it is, FRAPS. From Dust was unplayable on my Windows 7 installation at ~15-20FPS average. Now it's 27-32FPS average. All my games have a similar effect.