A lot of people know that these are gaming computers but they are not sure if the differences would be enough to make them choose one type over the other. The screen size of these two is different with the M15X having a smaller screen at 15.6 inches while the M17 comes with a 17-inch screen. M17 is considered to have more high-end options since the memory card is also higher at 16G while the M15X only has a 512MB GeForce Card. The weight of these two laptops is also different from each other. The M17 is heavier. It is actually about more than 2 pounds heavier than the M15X.