99% sure this is just a readout bug, since I'm fairly certain my CPU would be dead if it was actually getting 2.640v VCCIO (and it's exactly 2x what I entered).
Saw 1301 had "Improved DRAM compatibility" listed in the patch notes so I updated from 1007 hoping to eek out a few more mhz on my RAM.
Unfortunately I haven't had a chance to see since I'm currently cleaning my pants after booting into Windows and seeing 2.640v as my VCCIO voltage.
Went back to the BIOS and it's also reporting 2.640v VCCIO.
BIOS bug?