Originally Posted by IceB
I have finally figured out the cause of the OC instability with all the hardware installed.
Well it is much easier, and yet took me 2 days to solve it.
The main cause is power saving C states / EIST that were all on auto.
For some reason after the PCIE video card / PCI sound and the hard disks installation it was just crashing any possible OC.
Disabling all of them stabilized the OC, but I had to find out the way to get the rig stable with the Vdrop and the Multi drop on idle for 24/7 usage.
Enabling any C state caused BSOD.
I have started to eliminate the variables from the equation with the C3 enabled.
Updated the Samsung 840 pro SSD firmware - still BSOD.
Disabled all the hard disks beside the SSD - BSOD.
Took out sound card - BSOD.
So the reason is the 6950 PCIE.
The I have enabled back the integrated graphics of 4770K while still using the PCIE 1 with the 6950... and Voilà...
All came back to normal...
ARE YOU KIDDING ME ?!
However, i do not know the reason for the C states to crash the system while IGP is disabled, but as the matter of fact keeping the IGP enabled made all the difference.
Now all the C states are on Auto as well as the Turbo and EIST.
I have edited the power saving profile advanced settings in Win8 to get the minimum CPU ratio at 5% and as a result got nice Vcore and Multi drop on idle.
Testing now with 4500Mhz at 1.22V / Uncore 41 / 1.15 vring / 4x4GB 2600C10 Gskill.
I hope this will be helpful to anyone struggling with this nonsense