CPU Core Speed Drops to 800mhz for a Second then Goes Up

[Vincent_22]

Alright i have a i5 6600 cpu sometimes core speed drops to 800mhz then it goes up again this happens in a milisecond and it happens to one core at a time not all of them.Example when cpu0 goes 800mhz the other three is 3.9mhz etc etc.

I fixed this with disabling speedstep and C-State from Bios.But then my cpu couldn't reach 3.9mhz as it stated as targeted turbo core frequency.It got stuck at 3.6mhz.

This doesn't give me any fps problems i just thought its weird want to fix it.And yes i have OCD.

Any help is appreciated.And im not overheating ran aida64 stress test for 2 hours 64c is the highest temp recorded.

 

[Supahos]

Turn speed step back on just leave cstates off, other option would be going in and ensuring windows is set to high performance mode, or ensuring your cores are unparked.

 

[Vincent_22]

Turn speed step back on just leave cstates off, other option would be going in and ensuring windows is set to high performance mode, or ensuring your cores are unparked.

I did try the leaving c-states on turning speedstep off didnt fixed the problem i'll try this way now maybe this was it.And how do i check my cores is parked or unparked ?

 

[Vincent_22]

Yeap Turning C-States off definitely fixes the problem but also getting my core speed stuck at 3.6MHz.Windows is on High Performance mode And Cpu Power Selected at %100 lowest and highest so i dont think its because of that.

 

[Supahos]

Are turbo boost and speed step back on?

Also unless you have that on a z board all 4 cores shouldn't hit 3.9 it should only do that when running one core hard (single core Benchmark perhaps?)

 

[Vincent_22]

Are turbo boost and speed step back on?

Also unless you have that on a z board all 4 cores shouldn't hit 3.9 it should only do that when running one core hard (single core Benchmark perhaps?)

Yes Both are on and my motherboard is Z170 Pro Gaming ASUS
Infact lemme give you all my system info

Asus Z170 Pro Gaming MOBO
i5 6600 CPU (non K)
2x8 Hyperx Fury RAM
ASUS GTX 1060 6GB STRIX
Thermaltake 650W Non Modular +80 Bronze PSU
WD 4TB Black HDD
Corsair 512 GB SDD

 

[Supahos]

Just set the CPU speed to 3.9 in bios. Never actually tried with a locked skylake but I know haswell/ivy could do a few hundred MHz above boost on all cores with a z series board

 

[Vincent_22]

Just set the CPU speed to 3.9 in bios. Never actually tried with a locked skylake but I know haswell/ivy could do a few hundred MHz above boost on all cores with a z series board

And how do i do that im not an overclock expert sadly

 

[Supahos]

Should just go into bios find the CPU settings and set the multiplier to 39

 

[Vincent_22]

Should just go into bios find the CPU settings and set the multiplier to 39

Did it still stuck at 3.6 with c states off

 

[Supahos]

Try setting Bclk to 108 or 109 and see if that'll work

 

[Vincent_22]

Try setting Bclk to 108 or 109 and see if that'll work

Fixed it by disabling C2 C4 C6 C States.