Carefull about the minimum system requirements that they list. I just got Sims 2 and it says OS : Windows XP, Me, 2000, or 98; CPU : 800 MHz or faster; RAM : 256 MB or more; .... CD Rom, big hard drive, good sound and video the usual.
I have a 950 with 512 MB of ram with a 64 MB video card and a nice sound card, biiiiig hard drive and of course the cd rom *rolls eyes*
I can not play the Sims 2, I can "run" the sims, I can load it up and it doesn't crash but it does not play smoothly (ie it renders the 3D environment and people every few seconds, not so pretty or flowy for a game). The default install settings have everything on the lowest settings you can choose. So just be careful cause they give you minimum requirements but that doesn't mean you'll be playing the game.