The new Diamond Viper V770 Ultra is Diamond's fastest video card. Diamond clocked the card at a very conservative 150Mhz core and 183Mhz memory. The card has the potential for more, allot more. Diamond included a little overclocking utility for you to explore just how much more. The program allows you to set speed up to 175 Mhz core and 200 Mhz memory. It's a shame it stops there because the Viper 770 Ultra we had for testing can go higher than that. As a matter of fact, we got the card to run rock stable at 185/220 with just the factory heatsink fan!