Will too high of a vcore make your overclock unstable?

May 27, 2018
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I have a i6600k and was following a guide on overclocking.

It said first step to go to 4.4 ghz + vcore of 1.35 then adjust according to stability tests upwards of 0.05 to 0.1.

I tested my system on prime for 20 minutes, at 1.35, it automatically has 3 of 4 workers stop.

At 1.36 it works fine for 20 minutes.

I then left it there for a bit, temps were about 84 max with a hyper evo.

Then, I thought that was too high, so I found another guide and it said start at 1.30 vcore.

I did that, and I was stable with 20 minutes of prime95, and did an overnight test and it was stable.

Does that make sense?

Is it possible that the higher vcore was unstable?

1.3v okay

1.35v not okay

1.36 okay

Is it possible that I just did the tests wrong, or might be memory related?
 
Solution
Well yeah, it does make some sense, there are various sensors in CPU and MB that are safeguarding against high voltages and just because you set a certain voltage that doesn't mean there wouldn't be any higher transient voltages at times and if they trigger some safeguard. Those are too short for SW to register so are difficult to detect.
Well yeah, it does make some sense, there are various sensors in CPU and MB that are safeguarding against high voltages and just because you set a certain voltage that doesn't mean there wouldn't be any higher transient voltages at times and if they trigger some safeguard. Those are too short for SW to register so are difficult to detect.
 
Solution

7664stefan

Honorable
Jul 18, 2013
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10,960
Overclocking by just looking up reference figures and voltages in guides does not make sense at all and might put your poor CPU at risk ;)
You should start with the frequency you target to achieve and then increase VCore in small steps until it runs stable. Please consider that every CPU is unique requiring its individual voltage for a stable OC.
To you question: I have not yet experienced that to high VCore makes the system unstable, unless linked to other voltage peaks or too high temps.
Usually I try as long as needed to find the sweat spot between clock and voltage. For my 3700k this is currently at 4,3Ghz as all above requires to increase VCore overproportionally...not worth it.