My system has i5 2400, which has HD 2000, the lesser version of your HD 3000. Having said that, I have no problem playing Skyrim in Ultra on GTX 560Ti 448, while my wife is watching HD streaming video HD 2000 at the same time. Ah, one problem is I have to play the game on mute so that she can enjoy the audio part of the the program. Other than that, I didn't notice downgrade in FPS or any other quality in Skyrim. If Skyrim is more CPU bound, how about Batman Arkham City, which is a lot more GPU bound? No problem.