hey ghot, it seems i have the same problem on my rig..
cant get it to reboot with higher than 3.7ghz. i can run 3.9ghz prime all day long, but when i reboot it says " overclocking failed "..
very odd, cause it seems to run very stable at 3.9ghz, and then backing down to 3.8 its definitely stable, but still i cant reboot without getting oc failed..
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