Who makes the fastest mobile GPUs right now? That question can be a bit tricky to answer, since getting identical laptops other than the GPU is difficult at best. Thankfully, AVADirect was good enough to send us a couple Clevo W860CU notebooks that are indeed identical, outside of the GPU. One sports AMD's top-of-the-line Mobility Radeon HD 5870 while the other is graced with NVIDIA's GeForce GTX 285M. Which one is the better option? That's what we aim to determine with this head-to-head duel.