I had a similar problem. I replace my old pentium E6300 with a Q8300 without reseting BIOS. The problem was a low VTT, because E6300 used a low 1.1v and with the Q8300 i'm using now 1.18. That fixed the problem!!
I know it's late to post, but i just wanted to give my opinion
I know it's late to post, but i just wanted to give my opinion