If the mobo doesn't have the F8 BIOS (I assume you researched and identified the most current BIOS version) one of 2 things will happen. The mobo may not boot at all, in which case you would need a compatible processor in order to update the BIOS.
The mobo may boot, but may not recognize all 6 cores. In that case, update the BIOS to achieve full capability.
Those are pretty much all of the options. Good luck!