GeForce 8800 GTS 640MB <- nice!
What games/demos you been throwing at it?
What Res you playing it?
What games you been enjoying atm?
Should be alright then I'd have thought as it's new enough. It's also certainly powerful enough. My system has a decent 500w supply for instance and runs fine.
Regarding 1,066MHz FSB CPUs, there are motherboards around to support them?! The RAM also doesn't have to match the FSB speed these days - particularly not on AMD systems, although faster is obviously better.
Graphics wise, my card runs nicely. Handles Oblivion at 1280x960 with all the detail cranked up and it's smooth. Can also play Bioshock at that res with most of the detail fairly high. I've recently played HL2: Episode 2 with all detail to maximum and AA/Ansitropic Filtering cranked up and it's run nice and smoothly. So yes. It's a nice card :)