I've been playing on my MBP w/ 2.4 ghz c2d and 8600m and its been working surprisingly well. I dialed down the setting just to maximize FPS, but other than weird choppiness with the menu screen the game has been very stable.
I'm pretty new to the game but I'm starting to get the hang of it, if anyone wants to skirmish or give me some tips my id is corohd.warpath
I'm not sure exactly what hardware that entails, but I'll guarantee you can at least play the game. Perhaps not with every setting on Ultra, but with some fine tuning I'm sure it'd play fine. The game scales well.
I'm pretty new to the game but I'm starting to get the hang of it, if anyone wants to skirmish or give me some tips my id is corohd.warpath