My friend just got a 2011 Alienware M11X with an Intel Core 2 Duo and 6GB (He's upgraded to 8GB) RAM and a 500GB HDD. It came with a clean install of Windows 7 and we've updated all the drivers we could think of to get it into tip-top shape. However, games are still running pretty slow/choppy; even Left 4 Dead which many people have used to benchmark it and say that it runs awesome. Any ideas on what it may be?