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.
4690K @ 4.6Ghz
2X4 Gigs G Skill F3-14900CL8-4GBXM
EVGA GTX 760 SLI
Fractal Design Define R5
Dual loop WC
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