MSI HD 6850 Cyclone Power Edition
 

MSI's HD 6850 Cyclone Power Edition comes at 860 MHz, which is the largest overclock out of the box of any HD 6850 available. The card also features a little switch to enable a silent BIOS which reduces fan noise considerably and makes the card a virtually noiseless experience to use, in both idle and 3D.

http://www.techpowerup.com/reviews/M..._Power_Edition