High temp's under a stress test !

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ominous11

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Apr 8, 2014
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-I5 4670k
-Corsair H75 54.0 CFM Liquid CPU Cooler

Hey guy's fairly new to overclocking but I got my system OC to 4.6ghz with a voltage of 1.5 to be stable.

I ran prime95 at first to check stability and I was checking out perfect with an average temp of 40c. I then ran Intel(R) Extreme Tuning Utility and I did a benchmarking with temps as high as 89c and I was stable. However when I ran the stress test under IETU after about 5minutes I hit temps over 100c !!! Is my cooling not good enough ?? Why are two different stress tests giving me such huge gap's in temp's ?? Did I do something wrong ??

I seem to run normal at these setting for my overclocking and my average temp is about 37c
 
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CompuTronix
ominous11,

As has already been mentioned, 1.5 Vcore is way too high, which will overheat and degrade your processor. Unless you plan to use below ambient cooling, temperatures are generally not controllable during stress tests such as IBT at Core voltages above 1.35.

Processor temperatures are driven by Vcore and clock frequency.

Overclocked processors can reach up to 150% of their Thermal Design Power (TDP) when using manual Core voltage (Vcore) settings, so high-end air or liquid cooling is critical. Every processor is unique in it's overclocking potential, voltage tolerance and thermal behavior.

Regardless, excessive Vcore and temperatures will result in accelerated "Electromigration" -...
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bgunner

bgunner

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The H75 is OK for a mild OC and not pushing much over stock but is weak for a hefty OC like you have. As for the temp difference in Prime 95 is prime does stress the the CPU but not to its max limit like ITB and IETU. With prime 95 you can actually use the system while testing where the others you can't because they use so much of the CPU. This is the cause the temp issue. The CPU is actually getting more use using the Intel program.

I personally like to use Intel Burn Test to test for max temps. I set it for maximum Ram, Extreme stress and for 40 runs when looking for max temps with a liquid cooling system.

1.35 V seems to be close to the upper limit for that CPU.
 
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ominous11

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Thanks for the reply's ! I had a great overclock at 4.4 with 1.225 voltage that was sitting at max temps of 75c but I got greedy and wanted more. Every time I benched-marked at 4.6 with IETU and under 1.5v the system would freeze. I guess I'll have to settle for 4.4 :)
 
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ominous11

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So if I had a bigger and better Liquid system would the voltage at 1.5 to OC too 4.6 be fine to use ??

 
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CompuTronix

CompuTronix

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ominous11,

As has already been mentioned, 1.5 Vcore is way too high, which will overheat and degrade your processor. Unless you plan to use below ambient cooling, temperatures are generally not controllable during stress tests such as IBT at Core voltages above 1.35.

Processor temperatures are driven by Vcore and clock frequency.

Overclocked processors can reach up to 150% of their Thermal Design Power (TDP) when using manual Core voltage (Vcore) settings, so high-end air or liquid cooling is critical. Every processor is unique in it's overclocking potential, voltage tolerance and thermal behavior.

Regardless, excessive Vcore and temperatures will result in accelerated "Electromigration" - https://www.google.com/?gws_rd=ssl#q=Electromigration - which prematurely erodes the traces and junctions within the processor's layers and nano-circuits. This will eventually result in blue-screen crashes, which will become increasingly frequent over time.

CPU's become more susceptible to Electromigration with each Die-shrink, so 22 Nanometer architecture is less tolerant of over-volting. Nevertheless, Vcore settings should not exceed the following:

-> Core 2

1st. Generation 65 Nanometer ... 1.50 Vcore
2nd Generation 45 Nanometer ... 1.40 Vcore

-> Core i

1st. Generation 45 Nanometer ... 1.40 Vcore
2nd Generation 32 Nanometer ... 1.35 Vcore
3rd Generation 22 Nanometer ... 1.30 Vcore
4th Generation 22 Nanometer ... 1.30 Vcore <-- i5 4670K

When tweaking your processor near it’s highest overclock, keep in mind that for an increase of 100 MHz, a corresponding increase of approximately 40 to 50 millivolts (0.040 to 0.050) is required.

This means that if you were already at 4.4 with 1.225, then you should only need 1.265 to 1.275 to reach 4.5 ... and possibly 1.325 to reach 4.6 ... NOT 1.500! That's a huge increase which is completely unnecessary and will gain you nothing except 100C temperatures and a degraded processor!

Regardless, your H75 won't handle the Core temperatures generated by high loads with Core voltages greater than about 1.275. For your current configuration, the highest reasonable overclock to aim for would be 4.5GHz.

Please read this Tom’s Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Thanks,

CT :sol:
 
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