According to Laptop Mag, The Radeon HD 6990M has a 1.7 billion transistors, 700MHz processor, 2GB DDR5 RAM, and has support for Direct X 11 and dual-card crossfire configurations. In a head-to-head battle with the NVIDIA GTX 580M, the Radeon 6990M performed better on 3D Mark by 20 percent. [Laptop Magazine]
This is fastest mobile GPU, right? Because you can get desktop GPUs with more power. Or speed. Or whatever you want to call it.
And I honestly still don't see the point of massive, high end GPUs in "laptops." The smallest computer packing this will have a 17" screen, weigh about 9 lbs, be a "mere" 1.5" thick, and run for about 20 minutes on battery from a full charge.