CPU And DRAM Overclocking
The same 1.40 V core limit was chosen for both the new and previous build, since we’re still a little concerned about the short-term deterioration that we’ve seen at 1.45 V or more. Once again, the processor seemed eager to shoot to 5.00 GHz, though extended testing proved it was only stable over the long term at 4.80 GHz.
Increased memory frequencies were far more difficult to achieve using this motherboard, though we might have had worse luck with the second set of memory modules. After a lengthy battle to repeat a stable DDR3-1866 CAS 8-9-8 from our previous build, we were forced to settle for DDR3-1600 CAS 7-8-7.
The P67A-GD65 (B3) responded to our overclock by disabling C1E and EIST. Doing so drastically increases low-load power consumption, while providing minimal benefits in performance consistency. We re-enabled these features.
Using the “Low VDroop” setting from BIOS along with its 1.376 V CPU Core setting allowed our CPU to increase from 1.34 V at low load to 1.40 V at high load.