Sorry about your troubles. Since you have tested with different RAM and GPU with the same results, I only see one option since there is no dual BIOS_SW.
Reflash F8, reset and retest. If you are using Auto settings in BIOS, try manual ones. The BSOD could be related to stuck setting, CLK, timing, voltage related to CPU or memory. A new CPU (just different) than what you have now might also work. But that's a hard pill to swallow and not a wise investment.
All board revs do not allow backwards flashing after version F7.. If you can't get it to work with efiflash like dmdilks suggests I think you may be out of luck. Even if you could boot to the second chip, and it was still F4, you can't copy it. Afraid this is all I have.