I read one review of the 7800 and the reviewer was running HL2 at the max resolution the card would do with 4x a.a. and 16x a.f. and it was still fast at max details.
He also ran other games that way and it never went below 30fps or so he said.
Phenom II 940 Black Edition quad core @ 3.5Ghz
2x1 gig OCZ PC26400 Platinum, 2x1gig GSkill PC26400
Some other stuff,
Even more stuff,
If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside. --Robert X. Cringely, InfoWorld magazine