i5 8600k LLC problem with Offset versus fixed Vcore comparison
i5 8600k LLC problem with Offset versus fixed Vcore comparison
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.
Adjust the settings to adaptive plus offset, keeping the offset at auto and leaving the vcore value you prefer. Set the cpu core voltage to your desired level and maintain llc at level 1. It seems your current setting is similar to theirs, ranging from 10 to 1 with a middle value of 4. A slight increase in vcore might be needed for stable overclocking at 5ghz on your MSI z370 SLI plus mb. When not in use, both vcore and cpu throttle should reduce as expected. Unless you're working on scientific calculations, AVX remains unnecessary—keep it on auto. For stability testing, consider using prime95 version 26.6.
Usually the maximum LLC is 5-6-7-8 based on your BIOS settings. The LLC is handling it well, but AVX is putting pressure on it, causing the CPU to be undervolted to prevent overheating. Try using a different workload such as OCCT or AIDA64. If problems persist and you need stability with Prime95, increase the LLC levels.
Usually the max LLC is 5-6-7-8 depending on your BIOS settings. The LLC isn't the best stress test anymore because Prime95 heavily uses AVX instructions, which causes the CPU to be throttled to prevent overheating. Try using a different workload such as OCCT or AIDA64 instead. If problems persist and you need Prime95 stability, consider increasing the LLC levels. I didn’t realize AVX was being disabled in Prime95, so that wasn’t the issue. Plus, I’m already at the highest LLC setting, and overclock guides still suggest Prime95 for casual use.
I haven't used prime95 before. I only overclocked on OCCT, which worked perfectly, but I recommend running it for at least 8 hours during the final stability test. Since AVX is off, I'm unsure how it affects level 1. Are you certain it's the highest LLC setting?
I haven't used prime95 before. I only overclocked on OCCT and it performed well, just ensure you run it for at least 8 hours during the final stability check. Since you have AVX off, I'm not sure how it affects things. Are you certain level 1 is the highest LLC setting rather than the lowest? I'm using the maximum LLC setting. ASRock offers their options in reverse compared to other boards. My ASUS z68 board had five settings ranging from normal to extreme. Most boards use a scale of 1-7, but this one goes from 1 to 5 with 1 being the highest and 5 the lowest. I have a picture below.
Thank you, sorry for not believing me at first—I've never seen a board like that before.
I plan to ask some friends I know to help me out.
Adjust the settings to adaptive plus offset, keeping the offset at auto and leaving the vcore value you prefer. Set the cpu core voltage to your desired level and maintain llc at level 1. It seems your current setting is similar to theirs, ranging from 10 to 1 with a middle value of 4. A slight increase in vcore might be needed for stable overclocking at 5ghz on your MSI z370 SLI plus mb. When not in use, both vcore and cpu throttle should reduce as expected. Unless you're working on scientific calculations, AVX can be left off—use auto and consider using prime95 version 26.6 for stability testing.