I am not new to flashing/system builds.
Flashed my GA-Z87X-UD7 TH to the new BIOS F3 and there are significant problems
1) rebooting loop at BIOS splash screen OR
2) HDD makes noises that I've never heard a HDD make (at BIOS splash screen), then system reboots OR
3) sometimes does actually boot
selecting "default" BIOS settings does nothing to fix this problem
... and I tried it 3 separate times ALL with the same results (flashing back to F2 hoping like hell that anything wasn't damaged)
There are no problems with the F2 BIOS
F3 is highly problematic and needs to be reassessed.