CPU getting hot on new build

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jerstern

jerstern

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Aug 8, 2015
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Hey guys. New to the forums and and have a brand new build - hoping someone can shed some light.

My CPU idle temp is around 35 - 39c, which isn't horrible. I downloaded a 7GB file and temps skyrocketed, so I ran Prime95 to see if it was a strange fluke. Within 20 seconds my CPU was 92c and rising, so I shut Prime95 down.

This is a brand new build from 2 days ago. I played with my fans until I found the lowest idle temp, which was: two 120mm intakes in the front. one 120mm INTAKE in the back (flipped it from being exhaust helped a lot) One 120mm exhaust in the top. CPU is cooled via the Evo 212, with 120mm fan pushing and getting air from the back case intake. Thermal paste is MX4 (thin layer. used a credit card to coat the cpu)

Any ideas why it's getting so hot so quickly? Ambient room temp is ~72F

Setup is as follows:
Corsair c70 case with solid side window
ASUS Maximus VII Hero mb
Intel i7 4790K (not overclocked)
G.Skill Sniper 16GB DDR-1866 RAM (running at 1866, not 1333)
EVGA GTX 960 4GB SC card
Crucial MX200 SSD (Mounted to interior, backside of case)
3 1TB WD SATA HDDs (in front panel)
Cooler Master 650W Modular PSU

Any help or ideas before I rip this thing apart would be greatly appreciated!
 
Solution
CTurbo
What are you using to read your temps? I recommend trying multiple means of testing temps and see how consistent the readings are. 93C is way too hot for a stock 4790k. If you have plenty of thermal paste, you may see how the stock cooler does. Are you SURE the fans are mounted correctly? Also, if you are going to use a 5th fan, it probably needs to be exhaust. Try one intake in front, one intake on bottom, and one exhaust in rear and two exhaust up top.

Or use the 5th fan for a push/pull config for the 212 Evo.
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CTurbo

CTurbo

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I think you should re-install the 212 Evo this time using a small pea sized drop of paste in the very center of the cpu. Clean off all of the old paste of course. Keep one fan in the front as intake. Move the lower front fan to the bottom middle as intake. Keep the top as exhaust and switch the rear fan back to exhaust. Have the 212 Evo fan pushing air through the heatsink towards the top exhaust fan.
 
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jerstern

jerstern

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Aug 8, 2015
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Sorry for the slow response. Busy Day. I took all of your advice, CTurbo. This was my first time doing the pea-sized application, so hopefully I did it correctly. I had a spare 120mm fan laying around, so I installed it in the bottom. My idle temps are now 32-36C. I read that Prime95 was terrible for Haswells, so I switched to SiSoft Sandra. Back to back testing, the very last one got me up to 93C (before that, it was low 80's)

I still feel like something isn't right, but I'm not overclocking this for now. It will be general use. School work, web surfing, games and minor graphic editing. Does this sound fairly normal to you? Do you think it'll be alright?
 
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CTurbo

CTurbo

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What are you using to read your temps? I recommend trying multiple means of testing temps and see how consistent the readings are. 93C is way too hot for a stock 4790k. If you have plenty of thermal paste, you may see how the stock cooler does. Are you SURE the fans are mounted correctly? Also, if you are going to use a 5th fan, it probably needs to be exhaust. Try one intake in front, one intake on bottom, and one exhaust in rear and two exhaust up top.

Or use the 5th fan for a push/pull config for the 212 Evo.
 
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Solution
nayrnayr1

nayrnayr1

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I have a computer with an AMD A8 65W, it idled at 38 with a high end air cooler. I think it might be your airflow, this CPU has little airflow. It is only used for openoffice, windows, chrome, stuff like that, it gets to about 48, I think that is odd, well it might be your airflow, make it positive. (ie change the direction of the fans, make it blow outwards.)
 
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jerstern

jerstern

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Aug 8, 2015
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ok, CTurbo, I set it up the way you said. I used the 5th fan as a push/pull config on the 212. Idling around 32-35C. I did the same tests with SiSoft Sandra and Aida64 as last time, plus a few extra. In Aida64, temps remained in the 60's and 70's with a few spikes in the high 80's. In Sandra, Temps were between high 60's and high 70's, with one momentary (1-2 second) spike to 89C.
:Edit: I'm using cpuid hwmonitor and real temp to monitor temps. They read almost identically, maybe 1-2 degrees difference. But in the midst of stress testing, at times, Real Temp would read ~10C lower than hwmonitor.

I am sure the fans are mounted correctly. I've actually been building and maintaining my PCs for the past 18 years. This is the fastest processor I've ever had, and never really ran into a temperature problem, so it really caught me off guard. These numbers looking a little better? Still doesn't seem quite right.

Nayrnayr1: I may try that if it comes to it. This case was built for airflow, and the PC is in a very open area.
 
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CTurbo

CTurbo

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It sounds like the push/pull config solved the problem. Those last temps are in the normal range. You know the stress test programs push the cpus to limits they'll never even come close to under normal usage even in high gaming.
 
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jerstern

jerstern

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Aug 8, 2015
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Sounds like a winner to me then. I know they push the components, but better safe than sorry, right? I simply felt it was running a little high and wanted it to be normal. I'm a fan of CPU longevity. I appreciate your help, greatly. Thank you!
 
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