Oblivion

The official minimum system requirements include a 2 GHz cpu, 512 MB RAM and a 128 MB graphics' accelerator. Those just happens to be the exact specs of my Pavilion laptop, which runs the game acceptably on low settings, with maximum draw distance and actor distance (to see scenery and characters far away). I can't really enjoy the great graphics with those settings, which is a shame. Maxing all settings gives me about 1-2 FPS, and I can't even enable antialiasing and HDR lighting.

Really though, if you have a 3 GHz computer, a gig of ram and a fairly new graphics' card, you should do great.