I have an alienware x51 and there is two problems with upgrading your graphics card. First off the case wont fit any bigger cards, so if you dont care about a cluttered desk from having an external graphics card then this could work, but the real problem is that the 330 watt powerbrick cant handle a bigger graphics card than the GTX 660. so if you want to spend money on buying a new power brick you might be able to upgrade with an external graphics card. Hope this helped.