NVIDIA has paired up the GeForce GTX 680 launched Thursday with its first notebook graphics sharing the same Kepler architecture. The GeForce GT 640M LE, GT 640M, GT 650M, and GTX 660M all use the new 28-nanometer building process both to be smaller and cooler than their ancestors as well as up the core count and clock speeds. They peak at 384 cores on the 640M, 650M and 660M and up to either 735MHz or 850MHz on the 660M, depending on whether or not it's using GDDR5 or DDR3 memory.
