Fluctuating CPU temps under load

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Joshua_111

Commendable
Aug 10, 2016
4
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1,510
So I just upgraded my CPU to an intel core i7-6700k. I also replaced the stock heatsink with a cooler master GeminII M4. I replaced the fan on this heatsink with a Cooler Master SickleFlow 120. I have also upgraded my case fan exhaust to a Cooler Master Blade Master 92 and added the same fan as an intake fan. My issue is that when I stress test it, using prime 95, the temps go up to 60 C really fast, but they hold there for about 5 min. After 5 min, the temps suddenly jump up to around 80 C. Then a couple of minutes later the temp returns back down to 60-65 C. This cycle continually repeats. Also during idle the temp will jump from 30 to something like 45 in a second just from opening chrome. I don't know what is causing this. Much less how to fix it. Any suggestions as to what I could do would be greatly appreciated.
 
Solution
synphul
80-85c isn't going to make the cpu explode or melt down or anything. It's a bit on the warmer side. Prime95 is a pretty torturous test for heat, v26.6 is recommended. It's not the most recent version, newer versions can cause higher temps on newer intel cpu's. Real world use will see temps lower than that, likely 10c lower.

What are your ambient room temps? That will have an effect on cooling as well.

A better cooler wouldn't be a bad idea, that's more or less a cooler designed for small spaces like a really narrow case, htpc case, etc. What kind of case are you using? It sounds like a smaller form factor between the low profile cooler and the 92mm intake and exhaust fans.

Many cases are using either 120mm or 140mm fans and have...
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Joshua_111

Commendable
Aug 10, 2016
4
0
1,510
Well actually I had it on blend and didn't realize it. Still though why do you think the temp goes up so high? Crappy heatsink? I'll try it on small ffs and see what happens
 
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synphul

synphul

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Mar 11, 2011
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80-85c isn't going to make the cpu explode or melt down or anything. It's a bit on the warmer side. Prime95 is a pretty torturous test for heat, v26.6 is recommended. It's not the most recent version, newer versions can cause higher temps on newer intel cpu's. Real world use will see temps lower than that, likely 10c lower.

What are your ambient room temps? That will have an effect on cooling as well.

A better cooler wouldn't be a bad idea, that's more or less a cooler designed for small spaces like a really narrow case, htpc case, etc. What kind of case are you using? It sounds like a smaller form factor between the low profile cooler and the 92mm intake and exhaust fans.

Many cases are using either 120mm or 140mm fans and have been for quite some time unless as I said yours is extremely narrow or something. The single 92mm fans for intake and exhaust may not be helping either. A case with better intake and exhaust design such as dual 120/140mm intake, top exhaust as well as rear exhaust may improve temps along with a better cpu cooler.

Have a read here for some figures on intel cpu temps and ambient room temps. If your pc room is a bit on the warmer side you're dealing with less efficient air temp for overall cooling. Meaning a better cooler will be needed to keep temps at a reasonable level at 30c vs 22c room temps.

http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
 
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Solution
J

Joshua_111

Commendable
Aug 10, 2016
4
0
1,510
Well I made sure to use prime95 v26.6 and that lowered the temp to pretty steady at 80 C. I then suspected that I had applied too much thermal grease, so I reseated the heatsink. I was very careful in removing the old thermal grease. After that I performed the stress test using prime95 small fft's and the temp held at 75 C. The thermal grease I used is Arctic Silver 5. That is a temp I am more comfortable with. I would like for it to be lower, but I can live with 75 C at full load. Now to answer your questions, ambient room temp in my room is anywhere from 26 C to 28 C. I have a micro atx case with one 92mm intake and exhaust fan. I can put a fan on the side of my case as there are a lot of holes for what I can assume is ventilation for the processor as these holes are directly across from the processor fan. I believe now ventilation is my biggest problem if I want to get lower temps. That would mean that buying an ATX case may be my best option. I have 2 120mm fans I could use as an exhaust and intake fans with an adapter if I had to for now.
 
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