How do I know when my OC is stable (i5-8600k)

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mjong99

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Sep 14, 2013
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First time overclocker here. I have an i5-8600k with core speed at 4.6GHz and Vcore set to 1.25.
I ran the AIDA64 CPU and FPU Stress test simulatneously for 6.5 hours. My average core temps were 70C and average Vcore was 1.224V which seemed fine to me. LLC is at Mode 5 out of 8 (MSI board). Voltage on Adaptive mode. CPU Ratio Mode on Dynamic.

How would I determine if the OC is stable? Do you just look at final core temps to see that there is no thermal throttle? Are there more factors to consider when determining if OC is stable?

 
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A stable OC at 4,7Ghz is more than enough. Don't even think about grilling your CPU unless you have too much pocket money.
For 24/7 usage I would suggest to go for 4,5Ghz max...thinking 'green' :D
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MCMunroe

MCMunroe

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Quick Answer: When it doesn't crash.
Short Answer: When it doesn't crash for 24 hours of doing what you care about on the system.
Long Answer: When it stays at a reasonable temp ( < 85C ) and passes a stress test.
 
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mjong99

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Also, will increasing the clock speeds negatively impact your system if it is already stable at a specific voltage. So for example if my system is stable at Vcore 1.25 and 4.6GHz, and also stable at Vcore 1.25 and 4.7GHz, will there be any downside to bumping up clock speeds to 4.7GHz?
 
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MCMunroe

MCMunroe

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No. You want to lowest stable voltage at a given speed. Lower voltage gives lower temps and wattage, but you need enough to be stable.

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7664stefan

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Try to find a balanced OC (and not the max possible) that keeps your system up and running with good temps. I feel the 5Ghz ambition is not worth going for as usually on machines we are using in daily life this is not necessary at all unless to collect some extra benchmark points.
You will notice that with every additional 100Mhz the VCore needs to be increased overproportionally. Thus keep looking for the sweet spot.
 
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mjong99

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I agree with you that 5GHz is not necessary which is why I've decided to keep it at 4.7GHz. Right now I think my system should be stable at 4.7GHz with BIOS Vcore set to 1.25V. CPU-Z reports my Vcore at 1.242V under benchmark tests. I've ran AIDA64 with CPU, FPU, Cache, and System Memory for 9 hours, average temps are 71C. Stable after running cinebench, 3dmark time spy, and passmark tests. I should be able to get 5GHz easily even under 1.3V if I wanted to but I'm satisfied with my OC as it is.
 
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7664stefan

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A stable OC at 4,7Ghz is more than enough. Don't even think about grilling your CPU unless you have too much pocket money.
For 24/7 usage I would suggest to go for 4,5Ghz max...thinking 'green' :D
 
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