The Alienware m15x is the more mobile gaming notebook release, having a 15" screen as opposed to the 17" screen of the m17x. It offers 8800M GTX graphics like the m17x, but not in SLI. The great news is that Alienware has integrated a feature called BinaryGFX in which a user can switch between integrated graphics and dedicated graphics depending on your need. If you're looking to do some hard core gaming, use the dedicated graphics. If you just want to type up a term paper, switch to integrated to save on power.