Hybrid EC Firmware defaulting to Normal when cold booting sometimes.

[L4d]

GA-MA78LM-S2H Rev. 1.0  and F11 BIOS
I currently have Hybrid EC Firmware enabled with my 720BE. It's stable under Prime95's Blend for at least 6 hours as a quad core (I closed Prime95 after 6 hours without an error).
Why on cold boots will the Hybrid EC Firmware be defaulted to Normal sometimes? When this defaulting occurs it's able to use Hybrid EC Firmware after I enter the BIOS and exit the BIOS with or without saving changes. This is only happening randomly sometimes...

[bytheway_r]

Not sure if your situation is the same but I've experienced random boots with locked cores, too. In my case it doesn't matter if I go into bios or not. On next boot it's always back to 4 cores. I think you may just have to get used to it.