9700K VCore Question

LiE · 9 Mar 2019 at 00:16

I have a 9700K and I'm tinkering with an overclock. It's on an Z390 Asrock Phantom Gaming ITX. I've set VCore at 1.3 with a high LLC. I'm seeing the Vcore hit 1.474 when running cinebench and it doesn't crash. If I lower the voltage or LLC it crashes. Temps look OK, about 70. Outside of the cinebench Vore fluctuates between 0.620 and 1.315. So it's only under 100% load do I see 1.474. Games don't use 100% CPU so VCore sits around 1.3. In Lightroom when doing some intensive stuff I see it peak about 1.42.

Should I dial it back? I did try 4.9 and that seems to hit the same VCore under 100% load.

Danny75 · 9 Mar 2019 at 03:12

The chap from Optimum Tech said he had success bringing Vcore down using Offset Mode and LLC 2 on that board. He was using a 9900K. Seemed to really like that board too.

The new Cinebench is using AVX instructions which ramp up the Vcore as you are seeing.

Maybe a good approach would be find the minimum Vcore (fixed) you need for everything else, then find the minimum Vcore (fixed) you need for AVX stuff like Cinebench, and make the difference the offset. If that's possible at all.

LiE · 9 Mar 2019 at 08:14

I’m still using Cinebench R15. Is my understanding correct that if I set 1.3v and the highest LLC it should hold 1.3? Trying to understand how I get from 1.3 to 1.47 that I see in HWInfo.

The offset mode was abit confusing, it’s done in mV and I wasn’t sure of the base voltate. I’ll have another look.

Danny75 · 9 Mar 2019 at 09:01

LiE said:
I’m still using Cinebench R15. Is my understanding correct that if I set 1.3v and the highest LLC it should hold 1.3? Trying to understand how I get from 1.3 to 1.47 that I see in HWInfo.

Not sure, could depend on board and platform. Some boards you have to actually choose Fixed (or Override) for it to function as Fixed/Override and then it shouldn't shoot past your max Vcore when using AVX. This is the case with the board I've most overclocked on, my MSI Z87 MPower Max. At default settings it actually uses a form of Adaptive. However, this may be different for Intel 8/9XXX series/other brands.

LiE said:
The offset mode was abit confusing, it’s done in mV and I wasn’t sure of the base voltate. I’ll have another look.

Good luck and hope you get better advice. Without having Intel 8/9xxx myself just thought I'd share something to look at/try if possible meantime.