Alienware m14x vs m17x

It depens on what you need. Need some ultra performance regardless the size of the laptop, go for the m17x. If you want to carry it around and still want a decent performance, go for the m14x. The first one will play your games at high settings, the second one medium-high.

All the M14X M17X are power enough to play the BF3 minecraft, the m17x is more expensive and high preformance.