Heh, yes. You should have zero problems running the game with that rig.
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I hope your right.
My buddy has the same setup as me, except a 3.2 P4 and a 6800 GT... It's run alright for the most part, but some of the out door areas butcher his FPS (20!).
I don't understand it either... Source runs like a dream, but this doesn't.
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I have an Athlon64 3500+, 1 GB of RAM, and a Radeon 9800 Pro. The only slowdowns I ever experienced were when the memory leak caught up to my memory. Quickly exit and restart the game though fixes this. Mind you, I'm not one of those people that just HAS to have 1600x1200 w 12xAF and 8xAA or anything like that.
EDIT: And yes, the Mac-10 equivalent does suck. But having skill 10 (max) with the Kill-o-matic (the Uzi) is just hilarious has you have pinpoint accuracy at full auto. Good times good times.