Reverted to F4 and I'm still having these problems. This is ridiculous. I've been running 3.9 forever without issue, and now I can't even boot at 3.3 with my 3.9 voltages. Memory is running below spec, so that's not the problem as far as I can tell. I'm going to try to do a more thorough flash. I've had boards in the past with configurable options where you can opt to clear more data.
Also, I noticed that I still have IOMMU in this F4 BIOS. Maybe I'm still running F5, but the version number has been changed to F4 or something silly like that.
: Using @BIOS, I was able to flash back to F3 and at least boot at 3.9Ghz with my old settings. Currently testing stability. For those who are curious, I checked both boxes on the @BIOS window. Something along the lines of resetting BIOS to default as well as clearing DMI pool data, or something.
: 3.9Ghz just passed 100 passes on LinX. Progress
Prime95 will be happening tonight. I may try flashing F5 again, but with @BIOS this time. Hopefully things go better that way.Edited by tehmaggot - 10/20/10 at 2:11pm