2500k w/ evo 212 @4.2ghz Temps too high?

KJBeard · Feb 8, 2015

I'd only just recently decided to overclock my 2500k i started with 4.5ghz at 1.35v and it was all stable though temps were reaching 80c on load so i decided to try 4.2 at 1.3v and I got a stable 74c on load, I then decided maybe prime95 would be a good idea just be sure and at that current clock and voltage i was instantly getting 81-83c, so i tuned down the voltage now at 1.25v and im getting max 76c with one core being at 69c, now from reading through this isn't normal, could it be that i have some setting wrong. In which case should i upload the bio settings, i havent messed with the paste i just stuck the cooler on and hoped for the best, any advice would be appreciated

CompuTronix · Feb 8, 2015

KJBeard,

Do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd, 3rd and 4th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.5, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the software utility AIDA64 shows the same results.

Prime95 v26.6 produces temperatures on 3rd and 4th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a 35% larger Die.

Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run only Small FFT’s for 10 minutes.

Use only Real Temp to measure your Core temperatures, as it was designed specifically for Intel processors: Real Temp - http://www.techpowerup.com/downloads/2089/real-temp-3-70/

Your Core temperatures will test 10 to 20C lower with v26.6 than with v28.5.

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

Also, what is your ambient temperature?

Thanks,

CT :sol:

KJBeard · Feb 8, 2015

My ambient temps typically range between 40-46c

Thank you for the info on prime ive been running and so far i'm getting a max 74c but usually sticking to the 70-71 mark, one core is running at 66 though

CompuTronix · Feb 8, 2015

KJBeard :

That can't be right.

40C = 104F
46C = 114.8F

Here's the temperature conversions and a short scale:

Cx9/5+32=F ... or ... F-32/9x5=C ... or more simply ... an increase of 1C = an increase of 1.8F

30.0C = 86.0F Hot
29.0C = 84.2F
28.0C = 82.4F
27.0C = 80.6F
26.0C = 78.8F Warm
25.0C = 77.0F
24.0C = 75.2F
23.0C = 73.4F
22.0C = 71.6F Standard ... or ... 22.2C = 72.0F
21.0C = 69.8F
20.0C = 68.0F Cool

KJBeard · Feb 8, 2015

Maybe im reading it wrong this is when my pc has been booted up and the cpu is idle, ill shutdown and come back and give a temp in the bios when i first boot up

CompuTronix · Feb 8, 2015

KJBeard,

Ambient temperature means "room" temperature, which is more accurately the temperature measured at your computer's air intake. Standard Ambient temperature is 22C, which is normal room temperature, and is the reference value for Intel’s Thermal Specifications.

Knowing your Ambient temperature is important because Ambient directly affects all computer temperatures. Use a trusted analog, digital or IR thermometer to measure Ambient temperature. If you don't have any type of thermometer, then just use the thermostat / thermometer in your hallway.

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

Thanks,

CT :sol:

KJBeard · Feb 8, 2015

Thank you for clarifying, ambient temperature is 24-26c

CompuTronix · Feb 8, 2015

Since your ambient temperature is about 3C above standard, you must subtract the 3C from your results in order to have a meaningful comparison to Intel's specs, which reference 22C Standard Ambient, which is normal room temperature.

This means that if you ran Prime95 Small FFT's and your maximum Core temperature was 74C at 25C ambient, then at 22 ambient your corrected Core temperature would be 71C.

Core temperature is 5C higher than CPU temperature due to sensor location. Intel's Thermal Specification is "Tcase", which is CPU temperature, not Core Temperature. Tcase for your i5 2500K is 72C. Tcase + 5 makes the corresponding Core temperature 77C.

The relationship between Core temperature and CPU temperature is not in the Thermal Specifications; it's only found in a few engineering documents. In order to get a clear perspective of processor temperatures, please read this Tom’s Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Thanks,

CT :sol:

KJBeard · Feb 8, 2015

Thank you very much for the workings out for me I will look through the guide, I just wanted to know if these temperatures are safe and average for the overclock using this air cooler.

CompuTronix · Feb 8, 2015

Let me put it into perspective for you; for your hardware at your current settings and ambient temperature, your maximum core temperature of 74C is within spec, which is 77C. :sol:

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2500k w/ evo 212 @4.2ghz Temps too high?

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