Out of the box, the GIGABYTE GTX 560 OC runs at 830MHz, or 20 MHz above the stock clocked cards, so no fussing with OC tools is required. We, of course will overclock the GIGABYTE GTX-560 OC until it begs for mercy. The 1 GB of GDDR 5 on the GTX-560 OC runs at a blazing 4008 MHz and it sports a hefty 1660 MHz Shader clock. As with all modern video cards, users will need a PCI-E slot, and the card is PCI-E 2.0 ready but is backwards compatible with PCI-E 1.0 with very little bandwidth loss. In other words, running it in a PCI-E 1.0 slot will still provide a lot of bang for a little buck, and it'll be a nice upgrade, even on older motherboards. GIGABYTE and Nvidia recommend using a good quality 500W Power Supply with 2x 6 pin PCI-E power connectors.



Link: Bjorn3D