The higher end of NVIDIA's GeForce 600M lineup may have been leaked this week. The GTX 680M, GT 650M, and GT 640M spotted in the Notebook Review forums would be true next-generation parts using the Kepler architecture on a much smaller, more efficient 28 nanometer process. The GTX 680M as the centerpiece would use the full GK104 core from the desktop and make the most of its speed with a 256-bit bus and GDDR5 memory.
