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i7 8700k overclock results and settings - Page 54

post #531 of 2432
I've started a custom of monitoring everything, so I don't know what values I used to have with my 2500k CPU, but now with an 8600k look at this graph:



5Ghrz Vcore 1.29 + 0.020 offset. LLC2 Asrock k6

Are these voltage variations normal in the stress test?
I'm a little worried

thanks
post #532 of 2432
so what is good mobo to o/c 8700k?
post #533 of 2432
Anyone else seeing differences in voltages between CPUz and Core Temp at idle and under load.

I'm on the 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 LLC1's negative vdroop.

Can anyone else replicate this on Taichi 8700k?
What's going on?
Why are they all different?
Is any correct?

Also can anyone confirm if LLC1 is above or below flat?? If it's below flat then I can safely increase bios vcore until I reach thermal limits.
Can anyone confirm what core voltages they are hitting on max load at 5ghz on other motherboard like Asus Hero X or Godlike? I think there's no way I'm hitting 5ghz at 1.32 in reality hence why LLC1 is very likely high.


Edited by delatroy - 11/14/17 at 1:01pm
post #534 of 2432
Is it normal that frequencies downclock? Is there a setting to lock the ratio on the Taichi?

In Cinebench it is fixed on 5ghz but in Intel Burn In stress test, it starts at 5ghz but downclocks to 4.8ghz automatically. Thermals are at 66c max so I don't know why it's downclocking like that.

Edit: it's AVX offset.. rolleyes.gif


Edited by delatroy - 11/14/17 at 2:20pm
post #535 of 2432
Quote:
Originally Posted by delatroy View Post

Is it normal that frequencies downclock? Is there a setting to lock the ratio on the Taichi?

In Cinebench it is fixed on 5ghz but in Intel Burn In stress test, it starts at 5ghz but downclocks to 4.8ghz automatically. Thermals are at 66c max so I don't know why it's downclocking like that.


I believe Intel software uses AVX instructions bringing your 5Ghz to 4.8Ghz.
post #536 of 2432
Quote:
Originally Posted by amd7674 View Post

I believe Intel software uses AVX instructions bringing your 5Ghz to 4.8Ghz.
Intel burn test uses linpack which most likely does have AVX.
post #537 of 2432
Had been testing in Linux with stress-ng and stress. 49x 1.28V was very stable.
But when I go to Windows and run OCCT (large data set) I can't even run 1h at 48x 1.31V.
Are those Linux tests really that bad or am I missing something?
post #538 of 2432
Quote:
Originally Posted by pion View Post

Had been testing in Linux with stress-ng and stress. 49x 1.28V was very stable.
But when I go to Windows and run OCCT (large data set) I can't even run 1h at 48x 1.31V.
Are those Linux tests really that bad or am I missing something?
Cannot comment on linux but OCCT is very stressful.
post #539 of 2432
Quote:
Originally Posted by pion View Post

Had been testing in Linux with stress-ng and stress. 49x 1.28V was very stable.
But when I go to Windows and run OCCT (large data set) I can't even run 1h at 48x 1.31V.
Are those Linux tests really that bad or am I missing something?

I wouldn't call it "bad," but the linux tests in this case simply don't provide a workload that reveals a vulnerability in your overclock. What I've gathered through poring over CPU benchmarks and overclocks while stability testing my own CPU, is that OCCT is one of the "harder" tests, along with Prime95 AVX and any form of LINPACK. Regardless of what you take away from your test results, I feel like the author of OCCT put it very simply:
Quote:
If OCCT reports an error, something weird has occured. For instance, OCCT asked for 2+2 to your CPU, and it got 5 as an answer, which is obviously wrong. This indicates that something is wrong with your hardware.

Speaking of which, I've recently completed a 24 hour OCCT Large Data Set test:



Settings are as follows:

Core Multipler 51x
Uncore Multiplier 47x
Bus: 100MHz
AVX Offset: 0
vCore: 1.35v average reported (I think 1.36 in BIOS)
LLC: 1 (Asrock Z370 Taichi)

Even though it successfully ran throughout 24 hours, Windows logged 5 WHEA entries, so it's not entirely stable. I've restarted the test at 1.37V and I currently have 0 WHEA entries at the time of posting, 6 hours into an OCCT Large Data Set run.
post #540 of 2432
Quote:
Originally Posted by Falkentyne View Post

I was wondering, why do you guys use OCCT large data set instead of small data set?

Does small data set fry your PC or something? Isn't it a stress test after all?

From the OCCT website:
Quote:
Small uses a very small (duh) set, which will use only a small portion of ram, and calculations will mostly take place in the CPU Cache. It will generate the most heat, but as it tends to only test the CPU, is overall a tad less efficient at detecting errors

Large uses a much larger data set, and will test thus the CPU, RAM, and/or chipset. It is thought to be the most efficient all-around mode to detect errors

Medium, as its name states, stands in between.
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