9700K 5Ghz OC Behavior

[Alcatraz1015]

Hopefully the image below is decent... I worked on getting my 9700K stable at 5Ghz 1.37V on all cores. Ran Prime95 v26.6 for 1 hr 1 min with 0 errors and 0 warnings. Temps hung out at high 80's max. What I'm seeing happen during gameplay is that my various cores are bouncing between 4.6 - 5Ghz repeatedly which is what's creating the "rainbow" effect in my below screen. Voltage was dropping from ~1.370 to ~1.34X.

 

Fyi, the spots in the image below where this isn't happening was CPU down time between loading up a couple of different games.

 

My AVX offset is set to -4 so I'm assuming that's what's causing it (-4 x 100 = -400Mhz)? I don't fully understand AVX or how it works so if this is causing it then any knowledge you can provide will be welcome.

 

I also have my CPU load line calibration set to level 6... which I'm sure is a factor as well for my not so consistent 5Ghz OC... I don't know that I fully grasp LLC either but I believe it is what's responsible for dropping the voltage? So, maybe if I return LLC back to lower levels or auto it will fix my issue? I would test it but I'm tired and messed with it all day.

 

Any additional OC tips would be great too. Thank you. Happy New Year.

 

[Jurrunio]

55 minutes ago, Alcatraz1015 said:

My AVX offset is set to -4 so I'm assuming that's what's causing it (-4 x 100 = -400Mhz)?

Exactly. This function is used to let the CPU run faster when not using AVX instruction set because Intel CPUs run much hotter and less stable with AVX. By dropping clocks when running AVX, you could squeeze more out of it elsewhere.

 

btw you could try P95 v26.6 since that doesnt use AVX, and then set an AVX offset that lets it stablize with the same voltage and LLC settings with the newest version of P95 (so it uses AVX). You should try overclock the cache/ring as well, keeping it within 300MHz difference to the core clock.

 

In other words, core and ring first, AVX offset last.

 

58 minutes ago, Alcatraz1015 said:

I don't know that I fully grasp LLC either but I believe it is what's responsible for dropping the voltage?

opposite, LLC is used to correct the voltage drop. For voltage regulation's sake though you should still let it drop, just not that much. For example, 1.4V idle down to 1.35V at full load.

[Juular]

Set AVX offset to 0, it should be stable at 5GHz anyway, might be somewhat hotter but that's irrelevant for gaming as it wouldn't draw much power anyway.

[Alcatraz1015]

4 hours ago, Jurrunio said:

Exactly. This function is used to let the CPU run faster when not using AVX instruction set because Intel CPUs run much hotter and less stable with AVX. By dropping clocks when running AVX, you could squeeze more out of it elsewhere.

 

btw you could try P95 v26.6 since that doesnt use AVX, and then set an AVX offset that lets it stablize with the same voltage and LLC settings with the newest version of P95 (so it uses AVX). You should try overclock the cache/ring as well, keeping it within 300MHz difference to the core clock.

 

In other words, core and ring first, AVX offset last.

 

opposite, LLC is used to correct the voltage drop. For voltage regulation's sake though you should still let it drop, just not that much. For example, 1.4V idle down to 1.35V at full load.

Nice, I almost had it. Thanks for your input. I set AVX offset to 0. And ran Prime 95 for over and hour and was still solid.