Weird CPU core speed drop down

[ade555]

Hi

After recent update to windows I noticed that my CPU core speeds drops down on couple of cores, now I never had this problem before as I turned off setepdown future in bios, all my cores should run around 4.3, also check power management, I'm not expert but why is this happening now.

I7-8700

https://i.~ibb.co~/2ZrHMT5/CPU-power-managment.jpg

https://i.~ibb.co~/z6LzxTK/CPU-speed.jpg

 

[LuckyBenski]

What's the issue? 4.3GHz is the all-core turbo for the 8700. Looks like they're running at almost 4.4.

 

[ade555]

What's the issue? 4.3GHz is the all-core turbo for the 8700. Looks like they're running at almost 4.4.

Fixed the image now, you can see some of the cores will drop to 798mhz

 

[ade555]

I have been running prime95 to load all the cores and you can see when stress testing all cores running at 3.2-3.3 which is the base CPU speed, stop the stress and everything back at 4.3? is this normal? I am under the impression that the i7-8700 should run on all cores at 4.3

https://i.~ibb.co~/Q9Vnkkw/CPU-no-stress.jpg
https://i.~ibb.co~/WVpg8Kf/CPU-stress.jpg

 

[ade555]

I think this is something to do with voltage and power, as you load the CPU will run all cores @4.3 for a while and after 30sec will gradually start to slow down, give min and all will be run at @3.3, vrm throttling? again all this is recent, use to be able to run all on 4.3 with out any drops.