HI, my settings are currently 349/699, seems to run better at this setting. The best I found is to keep going up about in increments of 10, then test the setting(you have to do this). Once the card has failed a setting go back down by 10 and save that setting, then run the benchmarks. I found out that with higher settings that the benchmarks kept locking up so I droped the memory down another 10 and now its fine. Good luck, BTW the card does get pretty hot when you overclock it this high, good luck and let us know how it goes.....