This card overclocked better than I expected, I was able to reach the core speed of 485 MHz and 1200 MHz on the memory. The card was 100% stable at that speed and no artifacts occurred. In reality and according to Riva tuner the card runs at 526 MHz core and 1200 MHz for the memory, very impressive indeed. Now you are probably curious to see if the Asus Extreme N7800GT is as fast as or faster than the 7800GTX.