Rise of Nations: I plow through it without fail.
Rome: Total War: I have to have several settings down when i have at least 1000-1500 troops in one battle,makes me wish i had room for my old CRT monitor since LCD's obviously scale like ****
Battlefield 1942: My HD 2600XT eats this game alive and asks for seconds.
Crysis: The killer of rigs,need i say more,i can manage Medium @ 1280x720 with 20-35FPS,could play at mostly low with a few things on medium @ 1680x1050 (Don't remember the FPS though,but it was barely playable)