z370 Taichi/8700k OC voltages too high

BIOS version 1.17
Z370 Taichi
8700k dellided/metal TIM
Win 10 set to Balanced power mode

If I set the CPU to 45 locked on all cores and set LLC to 1 and a fixed voltage of 1.200v I get min voltages of .665 but sustained voltage under load of 1.46.  If I set the LLC to anything other than 1 the voltages go higher (level 3 got to 1.54).  Load temps are in the mid 60s.

If I lock the CPU at 4.8 on cores, LLC 1, voltage at 1.200 I get the exact same results... .665 to 1.46
65c.

If I lock the CPU to 50 with everything the same I get same voltages but temps in the low 90s.

Is there some setting I am not seeing to get the voltages down under 1.4? This is really frustrating.





Edited by N.I. - 04 Nov 2017 at 4:02am

N.I. wrote: BIOS version 1.17 Z370 Taichi 8700k dellided/metal TIM Win 10 set to Balanced power mode If I set the CPU to 45 locked on all cores and set LLC to 1 and a fixed voltage of 1.200v I get min voltages of .665 but sustained voltage under load of 1.46.  If I set the LLC to anything other than 1 the voltages go higher (level 3 got to 1.54).  Load temps are in the mid 60s. If I lock the CPU at 4.8 on cores, LLC 1, voltage at 1.200 I get the exact same results... .665 to 1.46 65c. If I lock the CPU to 50 with everything the same I get same voltages but temps in the low 90s. Is there some setting I am not seeing to get the voltages down under 1.4? This is really frustrating. Forgot to mention... I reset BIOS back to default and I am getting VID .665 to 1.414. So basically this board seems to have its factory voltages set WAY too high... this is with Multicore Enhancement set to Disabled

If you're monitoring VIDs, that is not the true VCore. VIDs are normally much higher than the true VCore, and are not the actual voltage being used by the CPU. What are you using to monitor VCore? Is that the just in the UEFI, or in Windows?

VID is what the processor's VID table believes it needs, which is not necessarily (or at all) what the VCore needs to be. From experience with an i7-7700k, once you OC above 4.7GHz, the VCore requirement takes off. BTW, the highest VID programmed into these processors is 1.52V, and I've seen users run them at that voltage, suicide runs of course.

I suggest HWiNFO64 to monitor both VIDs and the actual VCore:

https://www.hwinfo.com/download.php

I reset the BIOS back to default, disabled multi core enhancement, set Windows to performance mode and HW64 is reporting an idle voltage of 1.395. Prime965 torture test spikes that to 1.414.

Went back into BIOS and set multiplier to 47 and voltages are idle 1.395 and spike to 1.519.

Can anyone tell me how to reduce voltages? Just going in and setting a manual voltage to 1.35 or whatever has no effect whatsoever.

Screen shot of 47 locked speeds with default voltages.  This is identical to the voltages if I go in and manually set the voltage to Fixed and 1.whatever...

Thanks japau, appreciate the info.
I stopped using HW64 because the vcore voltages were always ".665" volts so I could never tell what they really were. I have switched to CPU-Z and that seems to give accurate readings.
I am on 1.17 BIOS.
Right now I am stable at x48 with 1.315v and highest temp is 81c with Prime95 torture test.

I will try your above settings and see what I get, thanks again.




Edited by N.I. - 07 Nov 2017 at 1:52am

Used Conductanaught on both die and lid, yes. Using same cooler D15 in a Carbide Air 540 case... basically the best airflow case ever made.

I can go x49 with 1.36v (temps in high 80s) and x50 with 1.40v but temps are in the mid to high 90s. Voltages any lower than this fail in Prime95 torture test about 8 minutes in.

I am starting to think my 8700k is a dud... I have a spare 8600k, maybe I should be trying that instead.


Edited by N.I. - 07 Nov 2017 at 4:07am