this is the copy from the german site (translate with google)
Nvidia Geforce GTX 660 3072 MB (3GB DDR3)
The GTX 660Edition is a video card of the upper middle class, the GeForce GTX 660 GPU from NVIDIA. The GPU of the "Kepler" family based on the GK106 manufactured in 28 nm chip with 960 shader units and 1006 MHz (1072 MHz Boost). Of 3072 MB of DDR3 memory is connected via a through 192-bit memory controller, and works with 1527 MHz (effective data rate of 6108 MHz). Like the larger representatives of the Kepler-generation dominates the GTX 660, the dynamic clock adjustment NVIDIA GPU Boost, Adaptive Vertical Sync, the anti-aliasing mode TXAA and hardware-based H.264 video encoding engine for H.264 Main, Base and high-profile level 4.1 to 8 times faster at max. X 4096 pixels, the 4096th Course will also support NVIDIA 3D Vision, NVIDIA Surround and PhysX.