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Dramatic differences in core temps.

ChiefGunny
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I have my i7-4790k overclocked to 4.8 GHz and the Vcore at 1.38 as low as I could get it stable. It has a Corsair H100i GTX with the thermal paste it came with. When running Aida64 Extreme System Stability test the core temps are very different. At Idle they are 1-32c 2-33c 3-34c 4-27c and at 100% jumping from max high to max low at 100% 1--84c 59c 2--93c 63c 3--89c 62c 4--85c 54c. That seems a little crazy to me. With a H100i GTX this CPU should even get close to that. This thermal paste has been on the CPU for 1 year without being touched so it should very easily be cured. I know thermal paste doesn't cure but it does take a bit to get to its peak performance. Maybe I should lapp it or Delid it and put Liquid pro on it. I wouldnt have any issues Deliding it at all im really good at that kinda stuff but there is always the risk of dmg so maybe lapping the cpu and cooler would be good enugh. What do you think?

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I would replace the thermal compound.

I have an H100i and replaced the compound today, and i discovered almost 50% of it got dry and it didn't look great...

Temps went down 5°C (could also have to do with the dust that was in the rad :p) and the temp difference between cores also went down.

But your temps are quite high, which isn't really a suprise.

I mean 1.38V is quite a lot, with an AIO liquid cooler it's usually a good idea to limit the voltage to 1.35V

And 4.8Ghz is also quite a lot, it is nice you can reach such speeds, but it does cause a lot of extra heat.

I would turn it down and replace thermal compound if you can.

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Yeah probably your paste as samcool said

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I agree with @samcool55, thats a lot of voltage to be putting through that chip. I would repaste it and then try the test again.

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9 minutes ago, ChiefGunny said:

I have my i7-4790k overclocked to 4.8 GHz and the Vcore at 1.38 as low as I could get it stable. It has a Corsair H100i GTX with the thermal paste it came with. When running Aida64 Extreme System Stability test the core temps are very different. At Idle they are 1-32c 2-33c 3-34c 4-27c and at 100% jumping from max high to max low at 100% 1--84c 59c 2--93c 63c 3--89c 62c 4--85c 54c. That seems a little crazy to me. With a H100i GTX this CPU should even get close to that. This thermal paste has been on the CPU for 1 year without being touched so it should very easily be cured. I know thermal paste doesn't cure but it does take a bit to get to its peak performance. Maybe I should lapp it or Delid it and put Liquid pro on it. I wouldnt have any issues Deliding it at all im really good at that kinda stuff but there is always the risk of dmg so maybe lapping the cpu and cooler would be good enugh. What do you think?

As other have suggested remounting is your best bet, while tightening be sure to tighten in a cross pattern and to use a screw driver to dive approx 1/4 turn to snug them up. Also note your voltage are quite high for 4.8Ghz in general for a 4790K I would dial it back and test for stability to see what is the most optimum voltage you can run at. 

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The 1.38 voltage is the lowest it will run stable at 4.8GHz also I turned it way down the MOBO settings had it at 1.5+ it was a preset for the 4790k it has 2 OC presets 4.6 and 4.8 and I turned it down to 1.30 and it wasn't stable at all and 1.38 was as low as it would go and stay stable. I've had this issue with this chip for a bit when I used 2 other aftermarket coolers and all did the same thing no matter what I done. I used arctic silver on it and used the Cooler Master Hyper 212 EVO and got the same issues with it,

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7 minutes ago, ChiefGunny said:

The 1.38 voltage is the lowest it will run stable at 4.8GHz also I turned it way down the MOBO settings had it at 1.5+ it was a preset for the 4790k it has 2 OC presets 4.6 and 4.8 and I turned it down to 1.30 and it wasn't stable at all and 1.38 was as low as it would go and stay stable. I've had this issue with this chip for a bit when I used 2 other aftermarket coolers and all did the same thing no matter what I done. I used arctic silver on it and used the Cooler Master Hyper 212 EVO and got the same issues with it,

Don't use auto overclocks they overdo the voltage almost all the time. It sounds like your may have gotten the short end of the stick with the silicon lottery if your 4790K needs that much voltage to hit 4.8GHz unfortunately.

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Yea I think so to. I only used the preset cause its a quick easy setup and then I always adjust the voltage I never keep the voltage presets ever even at stock speed. the stock speed voltage on this mobo was 1.3 and that's just stupid for stock. so at stock I can get it around 1.18

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9 minutes ago, ChiefGunny said:

Yea I think so to. I only used the preset cause its a quick easy setup and then I always adjust the voltage I never keep the voltage presets ever even at stick speed. the stock speed voltage on this mobo was 1.3 and that's just stupid for stock. so at stock I can get it around 1.18

For stock voltage that is fairly high usually you see around 1.25V for most but of course it does vary a little. 

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