Mobile gaming rigs don't tend to be particularly upgradeable, so it's important to get all the horsepower you can up front. With that in mind, MSI's latest is delivering a little more oomph than its last lap-warmer. It's the GX680 and it's rocking an Intel Core i7 2630QM processor paired with GeForce GT 555M graphics, NVIDIA's latest bid at laptop pixel-pushing supremacy. That card has 1GB of GDDR5 memory onboard, while the system itself can be configured with up to 16GB of DDR3 -- rather a lot for a lapt
