I've got a similar spec machine, and as you say it runs great.
I have to say, although the graphics and the physics of the game are superb, the levels of the game are a little disapointing to me. I'm about 2/3rds of the way through it and apart from a couple of great moments...the levels have been fairly linear. I'd love to be able to walk around and explore...but if you try you just get shot at from everywhere!!!
At the same time as buying HL2, I also bought Far Cry, and have to say, I have been playing this more. Its a stunning game in every sense...for overall playability and fun...it beats HL2 in my book.
We could get really geeky and talk about benchmark scores and stuff...nah thats just plain sad!
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