Intel I5 3570 ( non - k) temp reachinh 80 degrees at IDLE after some minor self servicing.

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propcsanu

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Sep 24, 2013
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Hi
I am no expert in computers but I do manage. In fact I myself assembled a PC a year back with I5-3570 / Gigabyte B75 Mobo / 8 GB Ram. It went on with no issue. Recently I decided to open the PC for some minor clean up . And then I made a smart ass move of dismantling the CPU cooler with the metallic heat dissipator ( intel stock cooler ). I put them back in but now it seems the CPU is heating abnormally high . Earlier the idle temp remained around 45 to 55 Celsius. But now it starts rapidly from 40 to 50 /60 /70 and stabilizes at 70-75 Celsius IDLE temp. When gaming it goes to 100 degrees . I guess I messed up
the thermal paste allignment as all the fans are running normally. Is there any other reason it might be guys that I am missing . I am using speccy / speedfan to monitor the fan. Please help.
Sanu
 
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zAustin

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Oct 18, 2013
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Did you clean off the old thermal paste on the processor and heat sink with Isopropyl Alcohol when you reinstalled the CPU cooler? I couldn't really manage to gather that from the info provided. If you're running everything stock, the stock heatsink should work just fine at adequate temperatures. That would be my first guess if you had normal temps and then large spikes in temperatures shortly after performing a task like that.
 
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littleleo

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May 8, 2009
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Check to be sure all four post are secure and there is no movement of the heatsink and fan. If they are then perhaps the thermal paste is the issue as the others have said. I use a Qtip and Alcohol to clean off all the thermal paste from the CPU and the heat sink then reapply. I put a thin coating that you can see through over the CPU or you can use the pea method. Again be sure all four pins are securely attached to the motherboard and the heatsink and fan are firmly attached to the CPU.
 
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propcsanu

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Sep 24, 2013
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Thanks for all the responses. The CPU fan is just sitting tight. Now I may have to reapply the paste as the stock pastes seems to have worn away. Fan is moving fine . I also recently changed the OS from Win 8. 1 to Win 10.Now I am little scared to touch the processor and mess it so Can i just apply the thermal paste over the proccy in case I decide to use it or I have to really get rid of the old paste by applying alcohol.
Thanks
 
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zAustin

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Oct 18, 2013
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You should have thermal compound on the processor at all times, that's part of how heat gets transferred from the processor to the heatsink. If it is worn away, you would need to clean it off with the highest concentration of Isopropyl Alcohol you can find in your area, and apply new thermal paste - typically just a pea sized drop on the center and it will get dispersed as you apply the heatsink to the processor.
 
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littleleo

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May 8, 2009
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Yes you can leave the CPU in the case for a tower lay it on its side so the motherboard is sitting horizontal on the bottom and remove the heatsink fan. Then clean off all the thermal paste from the CPU and the heatsink. Then apply a very thin coat you can see thru over the CPU face, or use the pea method. Then reinstall the heatsink and be sure the posts holding it to the motherboard are correctly inserted and the heatsink is snug against the CPU and not moving. Don't forget to reconnect the CPU fan.
 
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