Batman Arkham City. It run's terrible. Even on medium settings, the dips are unbearable. It goes from 60-50-40-50-40-50-60. Also, Assassin's Creed II runs pretty bad. Skyrim runs alright. Actually, it runs great - 60 fps all the time, occasional dips to 50 in certain areas like Markarth and Riften (due to fog and water effects probably). But I have to run Skyrim in windowed mode, and disable my other card, because indoors it reads 60 fps - but the stuttering is unbelievable. Its like watching a stop motion picture. So I run the game in windowed mode. And while it runs fine, I feel a bit cheated (considering I have another 360 dollar card laying dormant beside the one I'm using).
I don't know. The drive support is pretty damn bad.