Benchmark Reviews posted a review on the ASUS GeForce GTX 580 Overclocked Video Card

ASUS is a well-known innovator of technology, but there are times when they recognize a good idea and strive to simply make it better. Queue the GeForce GTX 580 video card. Armed with the maximum number of CUDA cores and PolyMorph engines NVIDIA can deliver with the Fermi architecture, the GeForce GTX 580 represents their trophy effort to seize the performance market. While being similar to the GeForce GTX 480, the GeForce GTX 580 design updates the Fermi formula, improves upon the power appetite, reduces heat output, and increases graphical frame rate performance. ASUS raises the GF110 fixed function clock speed from 772 MHz to 782, while the graphics cores now operate at 1564 MHz. 1536MB of GDDR5 video frame buffer use a familiar 384-bit memory bus, clocked to 1002MHz for a 4008MHz data rate.

  ASUS GeForce GTX 580 Overclocked Video Card Review