Nvidia released the GeForce GTX 680 Kepler GPU today. “With Kepler we wanted not only to build the world’s fastest GPU, but also the world’s most power efficient,” said Nvidia’s James Wang.

The company says the GTX 680 introduces two major changes: A completely redesigned streaming multiprocessor and a new GPU Boost feature to increase clock speeds. It also draws “at most” 195 watts of power compared to 244 watts on the GeForce GTX 580.

Last year Epic Games showed off its next-gen target demo Samaritan running on three GTX 580s. That same demo now runs on a single GTX 680 with power to spare.

The card is available from $499 to $530, but is sold out everywhere. NVIDIA says that the supply will get better in the weeks and months ahead, so expect to wait a bit if you didn’t already get one.