p4 2.4ghz, radeon 9700 (it's slower than the normal ones, like 260 mhz or something), 768MB ram.

For TF2, i get around 20-30fps with just about everything on low. But i'm also running it at 1680x1050 res, too. It's very playable, but does slow to a crawl at times.

I get the same results in Half-Life 2 with everything pretty much on high. Ep1 & 2, i usually drop it down to medium and it's playable.

I'm not using AA or AF either.