Overclock doesn't stick under load

[Atlas780]

Hey guys,

 

so I'm not an expert or anyhing regarding overclocking. I bought a used i7-6700k with a Z170 board. 
I have it fixed to 4,5 GHz on all cores and the system is stable, here are my configs:

As you can see, I haven't touched the Voltage there, because I'm scared I would brick it. 

So it runs on 4.5, but when I give it a multicore load it immediatly throttles. It's not a temperature problem tho:

 

This was with Cinebench R20 Multicore (left) and the Intel Extreme Tuning Utility integrated Benchmark. 

Now this was Cinebench R20 Single Core and it pretty much stays at the frequency, although it does seem to spread the load between the cores when I look at Task Manager, which I don't really understand.

I tried overvolting it a little (Offset of +0,020 V), but didn't had the courage to go for more and it didn't change anything. So I reverted it. 

 

Any experts here who might have some Ideas why it's behaving this way and what to do about it to keep the overclock stable?

 

[svmlegacy]

3 minutes ago, Scoutingnugget said:

Any experts here who might have some Ideas why it's behaving this way and what to do about it to keep the overclock stable?

You've logged a lot of data here, and that's great, but nothing here is describing throttle reasons. HWiNFO will report CPU throttle reason for this platform. I suspect you are hitting a power or current limit, both of which can be raised in XTU.

[TrigrH]

set XTU to default and uninstall it, K CPUs should always be overclocked in the bios.

[Atlas780]

Just now, TrigrH said:

set XTU to default and uninstall it, K CPUs should always be overclocked in the bios.

the 4.5 GHz Overclock is set in BIOS, a friend said I whould install the tool to see if the configs stick. 

And also I can't take screenshots in BIOS

[TrigrH]

3 minutes ago, Scoutingnugget said:

the 4.5 GHz Overclock is set in BIOS, a friend said I whould install the tool to see if the configs stick. 

And also I can't take screenshots in BIOS

cool, uninstall XTU, download CPUZ, tell me what motherboard and cpu cooler you have, and ill tell you the bios settings you need to set.

[Jurrunio]

Of course it's not supposed to stay at max clocks all the time even when there's nothing to do. From what your screenshots tell it is getting 4.5GHz under load

 

15 minutes ago, Scoutingnugget said:

Now this was Cinebench R20 Single Core and it pretty much stays at the frequency, although it does seem to spread the load between the cores when I look at Task Manager, which I don't really understand.

dumb windows scheduler shuffling the task between cores, though it's only done by one core in every split second so it's still a single core score.

 

5 minutes ago, Scoutingnugget said:

And also I can't take screenshots in BIOS

Your phone should have a camera if it's not ancient

[Atlas780]

1 minute ago, Jurrunio said:

Of course it's not supposed to stay at max clocks all the time even when there's nothing to do. From what your screenshots tell it is getting 4.5GHz under load

Exaclty the difference, it stays at 4.5 under SIngle Core Load and Idle, Full Load, it drops down. 

 

3 minutes ago, TrigrH said:

cool, uninstall XTU, download CPUZ, tell me what motherboard and cpu cooler you have, and ill tell you the bios settings you need to set.

 

I have a CoolerMaster 120mm AiO, don't know the exact model cause I bought it with the CPU and Board used. 

But like all the data shows, cooling doesn't seem to be the problem.

 

15 minutes ago, svmlegacy said:

You've logged a lot of data here, and that's great, but nothing here is describing throttle reasons. HWiNFO will report CPU throttle reason for this platform. I suspect you are hitting a power or current limit, both of which can be raised in XTU.

Thanks for the tip, I tried it, but it doesn't detect any throtteling:

 

Also the CPU Package Power spikes at around 80 and even the stock TDP is 91W (although I don't know if you can compare that).

I added a whole Log file as an attachment, but I don't think it will tell you anymore.

log.CSV

[Jurrunio]

5 minutes ago, Scoutingnugget said:

Thanks for the tip, I tried it, but it doesn't detect any throtteling:

it does, IA: Electric Design Point/Others is stuck to yes. Does it go to something else when you stress test with Prime95?

[TrigrH]

8 minutes ago, Scoutingnugget said:

 

 

I have a CoolerMaster 120mm AiO, don't know the exact model cause I bought it with the CPU and Board used. 

But like all the data shows, cooling doesn't seem to be the problem.

That is Hwinfo not CPUz.

 

For starters you need to update the bios.

https://www.msi.com/Motherboard/support/Z170M-MORTAR

I recommend version:

A.9 or 7972vAA

 

after that.

Ensure XMP is enabled

disable C-states, speed step and turbo boost, spread spectrum

Enable Load line calibration to a moderate level

Set all core FIXED voltage to 1.3v

Ensure an all core multiplier of 45.

Set base clock / bclk to 100.5.

 

Ensure fast startup is disabled in windows power options

Ensure high performance power plan is on.

[Atlas780]

3 minutes ago, Jurrunio said:

it does, IA: Electric Design Point/Others is stuck to yes. Does it go to something else when you stress test with Prime95?

Good you mention stuck because it never goes away. Even after restart of HWinfo and Reset of Values, in Idle it's stuck to yes and running Prime95 doesn't change anything about it. 

 

3 minutes ago, TrigrH said:

https://www.msi.com/Motherboard/support/Z170M-MORTAR

 

For starters you need to update the bios.

https://www.msi.com/Motherboard/support/Z170M-MORTAR

I recommend version:

A.9 or 7972vAA

 

after that.

Ensure XMP is enabled

disable C-states, speed step and turbo boost, spread spectrum

Enable Load line calibration to a moderate level

Set all core FIXED voltage to 1.3v

Ensure an all core multiplier of 45.

Set base clock / bclk to 100.5.

Thanks, I will try that. But probably in a few hours, it's getting late here and that is something for tomorrow ^^

 

[svmlegacy]

1 minute ago, Scoutingnugget said:

Good you mention stuck because it never goes away. Even after restart of HWinfo and Reset of Values, in Idle it's stuck to yes and running Prime95 doesn't change anything about it. 

This sounds like a catch all to include turbo ratios. I'm more worried about the RING: Max VR Voltage... Try removing power limits via the BIOS? Better yet, overclock it through the BIOS.