Wait, you didn't see the one that just came in? The 6600 was a horse of a card! Opened my eyes to the awesomes of HL2 Sims 1 but get a few expansion packs, the vanilla version has so little in it when you go back from using a pack or two! Max Payne, you could probably run 2 as well. AoE II is a great call! Soldier of Fortune 1 GTA San Andreas (& III & VC) CoD2, great multiplayer
Rome: Total War Civ. 4 Battlefield 2 Warhammer 40k: Dawn of War and expansions TrackMania!! Far Cry, but only play the first few levels, the latter ones are crud.
100% classics: - Police Quest! - Where in the world is Carmen Sandiego? - Mega race - Twisted Metal - Space Quest - King's Quest - Indiana Jones and the Fate of Atlantis - Monkey Island (all of them)
Pretty much all adventure games of a few ago have really low specs -The first 4 of the Myst games (5-th one is 3D ) -Still Life -Syberia I&II -don't know how nobody mentioned it but Heroes of Might and Magic 3 is still one of the best games (IMO) - another classic from way back Midtown Madness (had endless hours of fun with it)