Tomb Raider Legend, when you have the "next generation" option on it bought my machine to it's knees. I could play with everything maxed out @ 1280x1024 but as soon as I put on next generation graphics the frame rate went down to 3-4fps. I don't know what the max requirements are but it's gonna need one h**l of a machine to run it with everything turned on. Oblivion comes to mind aswell, that requires a bad a$$ machine to play maxed out.