Custom PC Build Crashing

[Tentasquid]

My PC that I built around 7 months ago has been having crashing (game stops on one frame, loud buzzing noise) problems while playing games. It has been doing this ever since it was built, but usually only happens while playing more graphically demanding games, but there has been one isolated incident of it happening on a game that my computer should be able to run very easily. I believe my heat is okay as the most i have seen it get is around 75-80 degrees celsius. I have been told by a friend that it could be gpu problems, but I am not sure if this is it or not. I have already tried a refresh and restore of windows, memtest, new drivers, switching out power strip, and disabling conflicting drivers. Another thing, the crashes seem to happen at random times, anywhere from loading up the game to a couple hours of playtime.
My specs are:
CPU: AMD - FX-8350 4.0GHz 8-Core Processor
Motherboard: Asus - 970 PRO GAMING/AURA ATX AM3+ Motherboard
RAM: G.Skill - Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory
Hard Drive: Seagate - Barracuda 1TB 3.5" 7200RPM Internal Hard Drive
Graphics Card: MSI - Radeon RX 480 4GB GAMING X Video Card
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply
Case: Deepcool - TESSERACT SW RED ATX Mid Tower Case
Optical Drive: LG - GH24NSC0 DVD/CD Writer
It also has a corsair liquid cooler, but I do not remember which model.
There is also a card for wifi (TP link or something)

 

[helpstar]

a new motherboard for your AM3+ CPU would cost you about 150$, because of the expensive 990FX chipset. Or get a used one with at least 8+2 VRMs passively cooled on it.

 

[ohiou_grad_2006]

The other thing to is he stated at some point that his CPU had reached 75-80 degrees. So you have to wonder if the CPU is actually functioning properly as well.

 

[helpstar]

the more reliable thermal margin of amd overdriev was at 36.1 C under load, so I don´t think it´s cpu overheating itself, which normally would lead to throttling/lagging and not shutting down.

 

[Tentasquid]

Okay so i'm finally back (forgot to post this for a while, sorry) and i've fixed the crashing entirely. It turns out that my problem was the wifi card. I've replaced that and everything has been going great with no lagging, crashing, etc. Thank you all for staying around and helping me solve this problem, it's been a long journey.