I'm still trying to get fully stable at 4050Mhz (450Mhz x 9.0) and although I'm getting closer I'm still not there. With that said however I also haven't touched a single GTL setting either (despite planning to do so every day), lol! I'm gonna first work within the voltage settings and see how far I can get, then make my way to GTL tuning. Given your above post its probably a good thing that I haven't tested much with GTL's (since they might not be correct anyway). I'd hate to have spent hours and hours testing GTL settings only to find a new BIOS changing the GTL tables and make all my tuning useless! By the way the best I'd gotten so far is 2hrs 45min running Prime95 (v25.6) before one of the cores failing (always core1, well its actually core0). I wish there was a way to actually measure the GTL voltages for eacy core in real-time (using DMM). That would make life far easier but I've been unable to find such a voltage read point.