i haven't flashed my BIOS yet. i'm not sure if it's really necessary with the stock cooler. i can run 3DMark at 850/1300, but if i try to play CoD4 with those clocks i'll usually crash in about 10 minutes. i assume it's heat-related, so i won't bother trying to get mad clocks on these cards as long as i have the stock heatsink.