I am sorry. But because you do not give the requested information, we are made to speculate. I asked information about your RAM. But you did not take time to read the whole content of my reply and give me your RAM spec.
If you have 1600 MHz RAM, then you may be better off setting D.O.C.P or X.M.P. in BIOS depending on your RAM specification. This setting increases voltages to better cope with the components. If you have 1333 MHz RAM, no need to do that.
I have Asus P7P55D motherboard close to yours. I have 8 GB 1333 MHz RAM. Radeon HD5770, Intel i7-860.
Oh sorry about that, I did read your whole reply, I just forgot about that part while writing my answer
. Yes my RAM is 1600 mhz