Okay, so here it is. Took me about 10 minutes to get it 100% stable and i've been running Everests FPU-stress test for about 2 hours now without any problems. As you've probably already figured out my system contains an i7 2600k, an MSI P67A-GD65, and some other not-so-important stuff... The story was... I didn't use to be able to boot with anything above 4.6 GHz so earlier today i figured i might look for a newer bios cause i thought there might be some new features that would help me with my oc... It was running on v1.6 when i got it and i had heard about the v.1.8B6. Spent some time looking for it and i finally found it! So off i went and fetched a usb drive to flash it with. (Just copy the bios to the flash drive and open the flashing utility from your bios) Indeed it did come with a whole bunch of new tweak able parameters But the only important thing for me was the PLL override feature. -enable this and you can shoot for the stars! ................ Here we go... So now, a few hours later, i've managed to get it fully stable on 5.1 GHz using the following settings: CPU Multi: x51 FSB: 100.1 MHz (to make sure it stays above 5.1 GHz :nerd: ) CPU PLL override: Enabled! CPU Voltage: 1.45 (control center) 1.5 (bios) 1.528 (cpu-z) CPU VTT (also known as QPI VTT/CPU IO): 1.17, might be some room for undervolting... CPU System Agent: 1.03 CPU PLL: 1.8 PCH 1.05 (also known as southbridge): Default. Dram voltage: Default (1.65) Disabled Turbo. Kept the power saving features (EIST, C-states and so on) Don't forget to go to advanced cpu settings (at the bottom in the oc settings) and set the max cpu power to 255 BEFORE you disable turbo or it will down clock, under load, to keep it at the right TDP (bug?):3eyes: Temps and power usage... Using my customized H70 with res and additional 360 rad. In the Everest stability testing set to FPU stress only the temps are (after 2.5h): Core1: 70c, Core2: 80c, Core3: 80c, Core4: 77c With the fans currently going pretty noisy at 1700 RPM. As for power usage it goes: 100% Load: 315 watts And Idle: 135 watts! ...Accordingly to the Zalman MFC2 (whole system of course) Please note that these voltages have not been that carefully adjusted to maximize efficiency and the reason I did not do these last step fine tuning optimizations whatever, is of course cause we've all got different boards and CPUs so my numbers really wouldn't be all that relevant when it's "your" turn.