i7 8700k CPU frequency all over the place (built today)

[ClownsBlur_]

Hello to all. I have noticed straight away in Core Temp or CPU Z my CPU frequency is up and down like a yo yo. Is there some setting in the BIOS that keeps the frequency at 3.7GHz default? I will be overclocking soon though to hopefully 4.7 or 4.8GHz. Thank you

 

[ClownsBlur_]

My old CPU (i7 920 D0) did not do this, it stayed at 4GHz. I want to find out what the setting is in the BIOS that causes this. I can't remember.

 

[ClownsBlur_]

So there's no longer an option to keep my CPU at my preferred speed?

 

[ClownsBlur_]

That won’t happen, even running at full speed if the cpu is not in use it won’t draw much juice. Check the power draw in hwinfo when your pc is idle at the maximum performance power setting.

My 8700k @ 4.8Ghz 1.275v all core is only pulling about 17W right now.

Where is this maximum performance power setting? In Windows? Could you help me on this please?

 

[ClownsBlur_]

Where is this maximum performance power setting? In Windows? Could you help me on this please?

Thank you. I did this and Core Temp is locked at 4400MHz. The default clock is 3.7GHz on the 8700k. I haven't touched any settings in the BIOS yet. Or is this just default settings in the BIOS?

 

[ClownsBlur_]

My cores sit at 32-34c at 4400MHz in Core Temp. I guess that's great temps?

 

[ClownsBlur_]

I've set the power setting in Windows back to balanced (default) and manually overclocked my 8700k to 4.7GHz. I've set my CPU Vcore to 1.27v. Is this too high or just about right or would I be ok at 1.26v or even 1.25v? Thanks.

 

[ClownsBlur_]

I'm running at 4.8 on all cores at 1.24v. I'd drop it to 1.2v and run Prime95 for a while to see if it crashes. If it does, increase by .1v and repeat until it stops crashing.

It might help to change some other BIOS settings. I use these, which I think are recommended more often than not:

Cache ratio: 44
AVX Offset: 3
Speedstep: Disabled
Turbo Boost and Speed Shift: Enabled
LLC: Level 1 (this is the maximum on Asrock boards - I think some scale the other way)
VCCIO: 1.05v
VCCSA: 1.25v

I got my cache ratio on 45, AVX I left it default (didn't change nothing), Speedstep is disabled along with the other power saving features etc, LLC I actually left on auto as I've seen people mention that some might be ok on auto and others on turbo.