CPU Heat sink wrong temperature?

Andyandyy

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Aug 28, 2012
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Hi everyone, I recently just built a computer (just 2 days ago) and everything runs fine except for my CPU TEMPERATURE!

FX-8320
Gigabyte-990fxa-ud3

Here's what has happened:
I first used the stock CPU cooler (because I couldn't get my old CPU off of the after market heatsink). It worked fine! except I wanted to use the after market cooling (its still a crappy one) Arctic Cooling Alpine 64 pro. So I eventually got the CPU off of the heatsink and I swapped the stock heatsink with the Alpine. After turning on the PC, I checked my HWMonitor, it reads the initial temperature as 79 Degrees Celcius.
The temperature goes like: 79, 78,76,73, 70, 76, 74, 71, 68, 71 So it goes down and up but goes down in the long run. In my head, I was thinking, I just turned on the computer, it took 30 seconds to boot, theres no way it starts off at 79 degrees. So I went to bios to see the temperature, (after the CPU cooled down) it starts at 66 degrees and moves up to 79 degrees in about a minute, and it stays there.

I've touched the heatsink to see if the temperature is really true, at 79 degrees my finger shouldn't be able to hold onto the heatsink for a long time. I was able to put my finger on it, and hold it there without any issues.

It felt like 40 degrees to me when I did that. So I'm wondering what's causing the wrong temperature read?
- I've replugged the heatsink and the thermal paste is newly stuck on there (pea sized).
 

Andyandyy

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Aug 28, 2012
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Hey I just plugged in the stock cpu, the temperature did change to 40 degrees celcius now, but it stills goes like:

43,42,39,37, then jumps back to 43. Is that normal? I doubt it?
 

Andyandyy

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Aug 28, 2012
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Not 100% sure if it's normal, I hear the fan change speed dramatically every 3 seconds because of the temperature going from 38 down to 28 and repeat every 3 seconds (takes 3 seconds for the temperature change) Theres like almost no way the temperature changes so fast every 3 seconds from just browsing websites?