I'll post this here, to avoid the clutter of a new thread.
I've been fine-tuning my i7-2600K in a P8Z68-V Pro motherboard. Cooling: Noctua NH-D14. Over-clock objective: 4.6 Ghz. After a year with this machine, I felt that my VCORE was just a tad excessive.
I followed a plan to keep the Offset at either -0.005V or +0.005V, adjusting the "V_Turbo" or extra voltage in turbo-mode exclusively. Changing between the negative and positive offset values allowed me to make adjustments of only 2 mV -- as opposed to the 4mV adjustments in V_Turbo.
After reaching a point where a core fails (without BSOD) in Prime95 sFFT or lFFT after 8.5 hours, I decided to kick up the LLC setting to "High" or "50%" and then compensate with the voltage setting to get me just short of a 5mV increase over the previous setting. Then I ran LinX, choosing "Affinity" to four threads with HT Enabled.
This is what I got for the initial V_Xtra of 4 mV:
Now, I kick up the VCORE ("Extra Turbo voltage") another 0.004V to 0.008V:
Suddenly, the grouping is "tighter," but I know that an i7-2600K @ 4.6 Ghz should show as much as 127 GFLOPS, so I kicked up the voltage again by another 0.004V:
Later, I tried to replicate this setting for the same results, but they looked more like the previous one. I kicked up the voltage another 0.004V notch, but the results looked again like the previous one.
I realize that background processes will reduce the GFLOPS result; there are many things going on. Also, I'm not sure what I should expect: should there be a distribution of GFLOPS values? Should they be consistently near the same?
All comments will be appreciated.
Thanks.