Why is my FX-8320 getting so hot?

[arthur.forgac]

Hey, I'm pretty new to PC building and I have recently swapped out my old FX-4130 for a more powerful, second-hand FX-8320 with the intent on building a entry-level gaming PC.

As soon as I started my PC, I noticed something was wrong as the temperature was fluctuating between 40-50°C at idle, but I decided to give it a shot, since I was hyped for the new processor and I was sort of happy that it even managed to boot into windows.

Unfortunately though, just around half an hour into using it, the PC shut down, presumably from overheating. So I booted into BIOS and decided to check the idle temperature. After few minutes, it was at constant 49 degrees.

So I decided that I will try to re-apply the thermal paste (coolermaster master gel), since that was the step I was feeling the least confident with during the installation. I did it, this time I put there a bit more of the paste than before, but when I booted into BIOS and left for around 15 minutes I came back to this:

Can anyone please give me a tip/advice, that might help me?

note: With my previous processor the idle temp was between 38-40°C. I did not overclock it. My case is pretty huge, only has two fans though (not counting the one on CPU heatsink), but it was enough airflow to support my old FX-4130.

Images from BIOS:
https://ibb.co/jCBhs9
https://ibb.co/g8mtzp
https://ibb.co/e5ghs9

Specs:
AMD FX-8320 8-core
Asus Radeon HD 7970
Asus M5A78L-M LX motherboard
2x Kingston Hyperx Fury 4GB DDR3 Memory
Seagate Barracuda 1TB 7200RPM HDD
EVGA 80+ certified 600W PSU
Huge old ugly case of unknown origin™

 

[Darkbreeze]

First, your motherboard is not high enough quality to support 8 core FX processors. It might technically support it, but the VRMs and other thermal qualities of the motherboard are not good enough to run that CPU on it.

http://www.tomshardware.com/forum/id-2384030/motherboard-tier-list-am3-chipsets.html

I would highly recommend a better, higher quality motherboard. I would also recommend that you change chipsets when you do get another motherboard. I high quality model from the AMD 970 or 990fx chipsets would be a good idea.

Secondly, you make no mention of the CPU cooler being used, and while your previous CPU might have been fine on that motherboard and using that cooler, you now have TWICE the number of cores on the same package, so heat is going to be twice as drastic if you do not increase the cooling capabilities through the use of a CPU cooler intended to handle the thermal design power of that CPU and also probably upgrading the case cooling to either larger fans with higher CFM capability or the additional of more fans.

Are there additional cooling fan locations not being used in that case? Where are they located?

Some screenshots of the case in front, back and top, both inside and outside, or the case model number, would be incredibly helpful. Perhaps even essential, in helping to make recommendations.

Likely you are going to need a new motherboard and CPU cooler, at minimum, in order to run that 8 core CPU.