Strange Core Frequency drops, i7-6700K

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felix.menke.83

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Aug 27, 2017
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Hello,
Recently of month without issues my PC is showing some strange behavior.
My PC is i7-6700K, delidded with conductonaut, Asrock Z170 OC Formula, NH-D15 cooler, bequiet Straight Power E10 400W.
All Power limits have been turnes off on the Mainboard and Windows runs as High Performance.

While in Windows in Idle using the "high performance" preset one of the cores (not always the same) is randomly reducing the frequency to 800 MHz for like a second. After that its getting back at max speed.
This happens at overclock/undervolt settings as well as UEFI defaults. Bios is up 2 date (7.41 but it happened as well with 7.40). 2 hours OCCT/Lin runs without errors (have not looked at frequency yet though but I suppose it happens as well).
So right now I have no idea wh that is happening all off a sudden. Does anyone experience this as well? I really wanna find out why its happening and solve it.
I came to find this since I had massive FPS spikes during HotS after 1 or 2 hours. The spikes were only lasting 1 sec at a time and afterwards I could continue playing without issues for about 2 hours. I suppose that happened when the core which had the load got its frequency droppes to 800MHz.

Looking forward to help (what can it be, what can I test,...)

Thx
 
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mdd1963

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Jan 14, 2006
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Normal behavior.

During periods of low/light tasking, the mainboard drops the core voltage, and the clock down to as low as 800 MHz or so....

Once some actual work begins (start a Defender scan, for instance) the speed will ramp up to near max for the duration of the scan....
 
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felix.menke.83

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Aug 27, 2017
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Actually I am not sure its normal when energy preset is set to High Performance, isnt it?
My understanding is that it should always Stay on max core speed then. With other energy plan I agree with you.
Also its not all cores together (due to overclocking I have set it to sync all cores) but only 1 at random gor a sec...
 
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mcnumpty23

mcnumpty23

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Jul 15, 2011
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no its not normal behaviour

because they have it set to high performance power plan
 
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mdd1963

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Jan 14, 2006
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If you are set to Auto for multiplier in the BIOS, it is indeed normal behavior. RUn a Defender scan...presto, under load, back to 4 Ghz...when complete, down to 800-1000 MHz. Those not familiar with this are...well, clearly unfamiliar with SpeedStep and normal behavior with 6000/7000s series CPUs...

it is normal when set to Balanced within Windows Control Panel; I doubt "Power Saver" is going to help...

If you want to run at constant 4.1 GHz even while using Calc.exe, by all means, go to advanced settings with the BIOS, set CPU to manual instead of auto in BIOS, and select 41 as your multiplier....

Then it will not jump up and down in clockspeed..as is otherwise normal..

Should enabling "High Performance' completely override the normal SpeedStep process? It might, sorrry, I had never used that feature. I will test it....
 
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mdd1963

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Jan 14, 2006
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Sorry, guys, i was indeed wrong...if Control Panel/Power Options is set to Hi Performance, it stays stuck at 4.5 GHz for the 7700K (after a reboot to lock in the changes, of course) (Can't understand why anyone would want to sit at idle at max clock speed, however....the speed ramps to max under any sort of load anyway...gaming, virus scan, etc....)

If that feature is not working, I'd guess chipset drivers and/or Intel drivers not loaded...maaybe running off of default MS drivers somewhere...
 
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felix.menke.83

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Aug 27, 2017
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Somehow I think this is the first post/answer actually underatanding the problem.
Due to the FPS issues I have set the CPU to High Performance (and yes usually I run it at 4.t GHz not Auto). so it should always be at 4.5 no matter what, but one of the cores (not always the same) will show short spikes to 800).
About the drivers I thought as well, so my next step will be: Clean Windows install, but first I think I will run OCCT and see if it happens there as well.
 
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