The emergence of efficient components, tiny SSDs and Intel's Ultrabook brand has seen the laptop market shift towards lithe, light machines, but they're still no good if you're a keen gamer. If you want to play new titles at high settings, you still need a chunkier gaming machine ? and the MSI GT70 could be one of the most powerful we've ever seen.That's down to one component: the GeForce GTX 870M. It's the first mobile GPU to emerge from Nvidia's new range, and it supercharges the firm's high-end hardware to return some of the best results we have ever seen from a laptop.The GTX 870M has 1,344 stream processors, which is one of the largest amounts ever included in an Nvidia mobile GPU, and they're clocked to 941MHz ? higher than every enthusiast GPU in the firm's last mobile range. There's GPU Boost, too, so this chip hits a peak of 967MHz. Nvidia's new Maxwell architecture is currently reserved for the mid-range, so the GTX 870M has Kepler silicon instead. Nvidia specifies this GPU with 3GB of GDDR5 memory, but that's not enough for MSI ? it's soldered 6GB of 1,250MHz silicon to this GPU, which is the most we've seen on any gaming notebook.