Is my i5 3570k running hot? Im so confused :(

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Penn2170

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Oct 18, 2013
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I can't seem to get any clear answers on what temperatures my cpu should be running at. I recently built my first pc so I am no expert. I have a core i5 3570k w/ stock cooler, p8z77-v mobo, and 2 sickleflow 120mm fans all in a cooler master 430 elite case. My idle temperatures were about 40-42C. Then I tried a stress test with prime95. It skyrocketed to 88 degrees Celsius which even I know is ridiculous. I re-seated the heatsink, moved a few wires around, and did 2 stress tests. My idle temperature now about 37-40 degrees. The stress test maxed out at about 84 degrees. On average I'd say it ran 78 to 83 degrees by the end of the warm up test. Here is my data and I'd appreciate anyone to interpret it for me. Is my cpu running too hot? Any replies are appreciated.

BW5dGgnCQAA8hcy.png:large
 
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The stock cooler is usually fine for stock speeds and voltage when installed properly on the first try. The TIM softens with heat, sticks to both surfaces and when you pull them apart for re-seating, the stock paste job is ruined. If you managed to get "significantly better" numbers from re-seating the HSF then something was definitely horribly wrong with your first attempt.
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aznricepuff

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Oct 17, 2013
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Those temps are not unusual with stock coolers, which are usually quite poor. They will keep your CPU from immediately melting, but not much more.

There are cheap and effective aftermarket coolers out there, like the Cooler Master Hyper 212 Evo, which is around $30 and will generally give you temps around 60-65C under load.
 
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Titan
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May 18, 2007
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80C is a bit hot.

When you re-seated the HSF, did you clean and apply new thermal paste? The stuff Intel pre-applies to HSF is pretty stiff so it does not lend itself too well to reuse even on a good day so you have to get it right on the first try for best results.

My i5-3470 maxes out around 65C using the stock HSF but speedboost does roll back from 3.46GHz to 3.3GHz. I would probably hit 70C if it stuck to 3.46GHz.
 
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Penn2170

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Oct 18, 2013
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I don't have any paste on me so I just re-seated it thinking maybe it wasn't seated properly or there was a large air pocket. My temperatures are significantly lower now but as you've said not optimal at all. I'll probably go with a cheap cooler master HSF with some high quality thermal paste and try that out as aznricepuff said.

I was definitely considering other aftermarket HSF's before I built my pc but most people said the stock cooler was fine. Obviously it's not.
Thanks for your help.
 
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Titan
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May 18, 2007
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The stock cooler is usually fine for stock speeds and voltage when installed properly on the first try. The TIM softens with heat, sticks to both surfaces and when you pull them apart for re-seating, the stock paste job is ruined. If you managed to get "significantly better" numbers from re-seating the HSF then something was definitely horribly wrong with your first attempt.
 
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