"Yes Nvidia is not skipping the 6xx series. Nvidia's new flagship, the GTX 680, is going to be 45% faster than AMD's current flagship, the 7970.
But the surprising thing is that the GTX 680 is going to have a frame buffer of just 2GB compared to the 3GB of the 7970. Oh well, as long as it's fast, I will be all for it.
Check the charts below for specs, prices and release dates."