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z370 Taichi/8700k OC voltages too high

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N.I. View Drop Down
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    Posted: 04 Nov 2017 at 3:59am
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




Edited by N.I. - 04 Nov 2017 at 4:02am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N.I. Quote  Post ReplyReply Direct Link To This Post Posted: 04 Nov 2017 at 6:10am
OK, I gave up on custom OCing and went over to the Optomized OC settings menu, but no matter what setting I set that to (even the lowest of 4.5 GHz) when I start Prime95 (latest version) it turns down the CPU to 4.295 GHz. This happens no matter what I set the BIOS OC setting to.
Temps never go above 70c

If I set the board to no OC and then just enable Multicore Enhancement it idles at 4.7 GHz and then under load goes down to 4.3 and voltages are pegged at 1.414
Temps do not go above 65c

Could this be bad board power management?


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Post Options Post Options   Thanks (0) Thanks(0)   Quote parsec Quote  Post ReplyReply Direct Link To This Post Posted: 04 Nov 2017 at 8:57am
Originally posted by N.I. 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

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N.I. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N.I. Quote  Post ReplyReply Direct Link To This Post Posted: 04 Nov 2017 at 10:46am
I am using HW64, but thanks.
I just don't think the Taichi can do a proper OC at this point.

I have gone through every combination I can and no matter what either the voltages are too high or the CPU power throttles.  Temps are all within normal parameters though as this has been delidded.

I am also getting Yes on "IA: Max Turbo Limit" and "RING: Max VR Voltage, ICCmax, PL4" in HW64


Edited by N.I. - 04 Nov 2017 at 10:49am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N.I. Quote  Post ReplyReply Direct Link To This Post Posted: 05 Nov 2017 at 12:23am
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...


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Post Options Post Options   Thanks (0) Thanks(0)   Quote japau Quote  Post ReplyReply Direct Link To This Post Posted: 06 Nov 2017 at 11:23pm
Hi N.I,

I got Asrock z370 Taichi allso with 8700k OC to 5.0-5.2 depending on heat i want to generate. Are you running on 1.10 / 1.17 / 1.20 BIOS?

I suggest first you do is Clear Cmos and then update to latest 1.20 BIOS.

Then on new bios you should first set LLC=1 (Asrock LCC is counter intuitive to other MB manufacturers)

Then try example offset -50mV and all core x46-50 and see where your Voltage lead from Intels VID table. Allso you can try manual 1.35V and see (HWINFO64 VCore) with example CPU-Z Stresstest (light load) what voltage your processor cores are using.

If after latest bios your voltages skyrocket i think your board is dud. better RMA for new.


With the latest BIOS i noticed my 50x multiplier (-30mV offset) run around 20mV more, so i had to reduce offset to -50mV. Seems i get a bit more fluctuation in voltage than with 1.17BIOS that i dont like. Mayby some Asrock emplyee can verify this?


PROBLEM: You are watching intel's VID table, that is not the real voltage your processor is using. Scroll down where you see VCore. Thats your voltage that you can alter with BIOS settings.


Edited by japau - 06 Nov 2017 at 11:25pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N.I. Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2017 at 1:49am
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
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Post Options Post Options   Thanks (0) Thanks(0)   Quote japau Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2017 at 3:20am
What cooler and what liquid metal are you using? I allso delided mine. I can run 50x  1.31V. 
Temps should be around same as voltages are pretty close.

Im using NH-D15s and get arround 70'c prime temps with 1.318v. 

Did you apply liquid metal on both surfaces (processor and heat spreader) before putting things back together, or only on the silicon side? Allways best connect when applied on both sides.

1.31V for stable x48 is good starting point.

For 50x stability other voltages i apply,

VCCIO 1.140 (1.160V read with HWINFO, asrock boost 20mV)
VCCSA 1.170 (1.200V read with HWINFO, asrock boost 30mV)
DRAM 1.38V (1.400V read with HWINFO, asrock boost 20mV) 

My RAM is running 4000-17-17-17-2T, Could not get 4133c19 any tighter nor really stable.


I would not stress too much full prime AVX temps as those you hardly ever encounter. Would rather find nice offset voltage so that with light loads your voltages drop and your fans dont have to run so loud.


Hardest part of Coffee lake OC was to try getting 4000+ memory timings correct and stable. With liquid metal theres allways room for temps if high AVX loads hit. with AVX loads even my 24/7 offset voltages jump to 1.36+V even when im fully stable with 1.32V.

Just a thought.




Edited by japau - 07 Nov 2017 at 3:29am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote N.I. Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 2017 at 4:01am
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
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Post Options Post Options   Thanks (0) Thanks(0)   Quote delatroy Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 2017 at 4:29am
Looks like I have the same issue:

Are you also seeing differences in voltages between CPUz, Core Temp and A-Tuning at idle and under load?

I'm on the 8700k, Taichi @5ghz LL1 @ 1.32v in bios and I get the following peak voltages under load:

* CPUz 1.328v
* Core Temp 1.4191
* A Tuning 1.318v

That's huge variance over bios even with ASRock LLC1's negative vdroop.
  • Is this a bug?
  • What's going on?
  • Is any correct
  • Why are they all different?




Edited by delatroy - 15 Nov 2017 at 4:30am
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