Hey guys, I have a question. About 6 months ago I purchased a computer from Alienware, the Area 51 750i. Anyways, I'm just starting to get into computers and am stumped when it comes to checking compatibility of a graphics card because I keep seeing 16x and 2.0. I have a 750i SLI motherboard currently using a nvidia GeForce 9800 GT, and want to upgrade it. I have absolutely no idea on how to check the compatibilty for what I want to get (I'm looking for DDR3 and 1gb, and might use 2 graphics cards if its within my budget. Any help would be greatly appreciated. Thanks!