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post #3 of (permalink) Old 01-22-2014, 02:41 AM
mdocod
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  1. Intstall a small fan, blowing on the VRM heatsink.
  2. Set the chip to 4.5ghz
  3. turn off turbo core
  4. turn off any proprietary performance enhancement features. (any auto-overclocking or turbo-core enhancing features on the board)
  5. turn off all power saving features (like C states and cool/quiet, this is only temporary, you will probably be able to re-enable these after finding a stable overclock, but tracking down your best LLC settings for your overclock will require that you disable these temporarily)
  6. Set voltage to 1.45V
  7. Switch CPU Load-Line Calibration from Auto to "whatever else is available"
  8. I do not know what options you will have for LLC (it may be a variable range like a number, or a bunch of different "presets" like "normal" and "medium" "low" "extreme" etc. I do not know.)
  9. Set LLC to a custom setting.
  10. Boot and run a CPU stress test.
  11. Using hardware monitoring software, observe the CPU voltage as you transition from idle load to full load with the CPU stress testing.
  12. If the voltage rises above 1.45V during the stress test, reboot and reduce the aggressiveness of the LLC setting.
  13. If the voltage dips below 1.45V during the stress test, reboot and increase the aggressiveness of the LLC setting.
  14. Rinse and repeat this process of checking the voltage stability under a load vs idle voltage until you have the tightest possible variation from idle to loaded voltage. There will almost always be some voltage variation from idle to load, so aim for a setting that sags slightly when loaded, rather than rises slightly.
  15. Check BIOS for the default CPU VID. It should report this next to the CPU voltage control.
  16. Manually set the CPU voltage below the VID. (for example, if the VID is 1.45V, you should set it to 1.425V or less and start your testing there)
  17. Check for boot stability.
  18. Reduce CPU voltage manually a couple steps at a time and keep checking for boot stability. When boot stability fails, bump the voltage back up a "notch." Long term testing is not required here. You're looking for a "reasonably stable" under-volted setting. Do some quick stress tests along the way on successful boots to check the voltage variation from idle to load.
  19. Through the process of lowering the voltage, you may find that you have to reduce the aggressiveness of your LLC setting in order to maintain good tolerances from loaded to unloaded conditions.
  20. When you have found the "minimum" stable operating voltage (actual reported voltage under a load), you can now form a road-map upon which to overclock from.
  21. Every 100mhz increase will require roughly a 0.025V increase in voltage from this "reference" point you have discovered.
  22. Assuming your "reference" point, is [email protected]~1.325V (probably will be close to this), then you should be able to run [email protected]
  23. Remember, 1.45V (assuming this is the voltage you wind up needing to run 5ghz), has nothing to do with the selected voltage setting (though it should hopefully be close). You're looking for a combination of manual voltage setting, and LLC setting, that results in 1.45V both at idle and under a load (as close to it as possible). This may mean using a voltage setting of 1.475V and a particular LLC setting that lands 1.447V under a load (this would be close enough). Or perhaps, a 1.4875V setting with an LLC setting that results in 1.451V under a load. Does that make sense? The reason for all the fussing around before to find that "ideal" LLC setting for [email protected], was to set up a starting point to make adjustments from to the LLC setting, so you would know which way to go as you create changes to the load.
  24. After setting the new "overclocked" setting, it is now time to test for thermal dissipation problems. (If you have done everything correctly up to this point, then the only stability issues remaining would theoretically be from thermals, not from voltage vs clocks) If the chip runs with plenty of thermal headroom under a load at this setting, then it may be worth exploring an even higher overclock. (just increase the multiplier and voltage increment by increment till you run out of thermal headroom).
  25. After discovering the maximum "reasonable" overclock based on available thermal dissipation following the 0.025V per 100mhz rule, it is now time to "optimize" this overclock a bit further by checking for stable headroom of under-voltage and/or overclocking on either side of this setting, without holding to the 0.025V/100mhz rule. It may be that it will run with a little less voltage, and with a little more clock speed.
  26. AFTER discovering that "ideal" LLC setting and voltage level to run the chip at the final overclock, you can now go back and re-enable all of the power saving features, and use an off-set voltage setting instead of a direct-voltage setting in order to regain your low power idle states. The "off-set" voltage setting is based off the VID reported. So you will just take whatever voltage setting you were using, and set the offset to make up the difference between that and the VID. This will get idle power consumption back down to "normal" for long term use.


Best of luck with the overclock.
Eric

PS: Your motherboard may have a slew of sophisticated adjustments far beyond the scope of this quick rough "guide." You may be able to use other fine controls of your board to fine tune your voltage/LLC regulation. I have no hands on with that specific board, but would advise that you should spend plenty of time researching all of the BIOS features so that you can properly exploit them for the best possible outcome.

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