I've been gaming the heck out of my GTX with all the settings bumped up without any lag. Have you all noticed a serious difference in speed with overclocking the 7800's? I had my 6200 OCed and notice small improvements. I haven't OCed my 7800 GTX yet just because I'm getting blazing responses with the stock speeds of the GTX OC (and I don't want to void the warranty if it's not really that much of an improvement). Is the minimal performance boost worth voiding the warranty on a $600 card?