I have got a E8600 too...
It can run 4500mhz @ 4.16V
I have spent 3 days on how to push it to 5Ghz...
In the bios, if i am over 1.6V the bios always says over voltage (Rampage Formula)
I scare and i didnt add more voltage in it...
Will it because my E8600 isnt very healthy...