Strange behavior on I9-10850k, cpu clocks drops

[xt13r]

Hello everyone!
I have some strange behavior on a working station in the office. I'm working in studio...And in studio bought new pc on 10850k. There is a good AIO watercooling and good PSU 750 Wt gold Corsair.
Under load in rendering, in 3ds max, during rendering in V-Ray, the processor behaves strangely. First, it accelerates to 100% of the load, then after a couple of seconds the load drops to 20-30%. Then 100% again and then it goes down again. And so on and so on.


But in OCCT test or in Corona render or in Linx test it behaves without any issues.
Any ideas why is this happening? And how I could fix it?

I tried to overclock it, disabled Intel Turboboost technology in bios, tried to adjust power management plan in windows (98% for high loads and low) and nothing helped.

Here is the specs of PC i'm working on in office:
mother board Gygabyte Z590 Gaming X (I updated latest bios on it!), cpu I9-10850K, water cooling MSI MAG CORELIQUID 360R

Could it be some issue with V-ray? Version of V-ray installed on office computers are 5.10.00.

[glennco]

I had something similar happen to my I7-8700k, it was the long/short power duration setting in bios, that needs to be set high enough not to power limit. Not sure what the settings are for your chip mine is 200W.
LLC I run adaptive or auto. Disable enhanced Intel Turbo.
Also, run MS Windows 10 power plan to "high performance" with 100% for min/max,
have you used HWmonitor or similar to see voltage, power draw, etc?
It's much more detailed than task manager.
Glenn

[xt13r]

I had something similar happen to my I7-8700k, it was the long/short power duration setting in bios, that needs to be set high enough not to power limit. Not sure what the settings are for your chip mine is 200W.
LLC I run adaptive or auto. Disable enhanced Intel Turbo.
Also, run MS Windows 10 power plan to "high performance" with 100% for min/max,
have you used HWmonitor or similar to see voltage, power draw, etc?
It's much more detailed than task manager.
Glenn

Hi, Glenn! Thank you for the answer! I will try to find and fix all settings you wrote to me) Hope I'll figure it out)
Yeah, I use HWinfo.

[xt13r]

It's worked! I'set power line calibration to Turbo and rised up Power Limits and now in render cpu works on 100 load all the time.
Thanks for the help, Glenn!