i5 8600k LLC issue Offset vs fixed vcore

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macabre215

macabre215

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Jun 16, 2008
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Hello,

I've been having a weird issue when testing my 8600k overclock. I seem to have a stable 5ghz overclock at 1.296v. However, I'm only ever able to sustain this voltage when using a fixed vcore and LLC Level 1 (the highest level). I'm using an ASRock Z370 Extreme4, and this board doesn't seem to allow LLC to work when using an offset voltage. What I mean by this is that I always have a .048v drop no matter what LLC setting I use.

This issue shows itself when testing Prime95. For example, when using a +.080 offset, Prime95 will drop to 1.248v. However, when playing a game or using RealBench stress test, the vcore will be 1.296. No matter what LLC or offset I use, there is always a .048v difference. It appears LLC is NOT working. And just to add, I am using the latest BIOS update that supposedly fixes any LLC issues. Is there maybe a setting somewhere in the BIOS that I need to adjust to fix this? I would like to use offset mode like I did coming from my z68 mobo. I had no problems with LLC using offset mode there.
 
Solution
urbancamper
Set it to adaptive+offset. Do not put an offset on. Leave that at auto. Then set the vcore to where you want it. And of course leave llc at level 1. Oh and by the way, my llc is set pretty much the same. It goes from 10 to 1. 10 being lowest, and one being highest. Mine is at 4, which is the same as your level 1.

There is a possibility you will have to slightly raise the vcore.

I used those setting to get a stable overclock at 5ghz on my MSI z370 SLI plus mb. Also that way when not needed both vcore and cpu throttle down, as they should.

One last thing. Unless your busy doing scientific calculations AVX does not come into play. Leave it on auto. Use prime95 version 26.6, if you use that to test stability.
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TechyInAZ

TechyInAZ

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Typically level 5-6-7-8 (whatever your max number is in bios) is the max LLC.

LLC is working it's just prime95 is hammering your AVX instruction set which is why it's not the go to stress tester anymore. Hammering AVX makes the CPU undervolt to insure it doesn't overheat.

Use a non prime95 workout like OCCT or AIDA64.

If your still having issues, or insist on having prime95 stability, run higher LLCs.
 
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macabre215

macabre215

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I forgot to mention I have AVX disabled in Prime95 so I know that's not it. On top of that, I'm already running the highest LLC. I'm just so used to Prime95, and overclock guides seem to still recommend it for coffee lake.
 
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macabre215

macabre215

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I am definitely using the highest LLC setting. ASrock has their options backwards from other boards. My ASUS z68 board was five settings from normal to extreme. Most boards have a scale of 1-7 from what I've seen, but this one is 1-5 with 1 being the highest and 5 being the lowest. I hae a picture below.

4cbe229c_GeE7IEd.png
 
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urbancamper

urbancamper

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Set it to adaptive+offset. Do not put an offset on. Leave that at auto. Then set the vcore to where you want it. And of course leave llc at level 1. Oh and by the way, my llc is set pretty much the same. It goes from 10 to 1. 10 being lowest, and one being highest. Mine is at 4, which is the same as your level 1.

There is a possibility you will have to slightly raise the vcore.

I used those setting to get a stable overclock at 5ghz on my MSI z370 SLI plus mb. Also that way when not needed both vcore and cpu throttle down, as they should.

One last thing. Unless your busy doing scientific calculations AVX does not come into play. Leave it on auto. Use prime95 version 26.6, if you use that to test stability.
 
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