Computer hard freezes after gaming for 5-10 minutes

MaxG123

Honorable
Mar 10, 2017
21
0
10,520
Anytime I play a game, my computer hard freezes with a weird buzzing sound coming from my speakers. It started happening a few weeks ago on GTA 5 (I thought it wasn't a big deal, since I have quite a few demanding mods installed), but about a week ago the PC blue-screened, and it started happening in other games (Farming Sim 15, Warframe, NFS Most Wanted 05, etc.) and sometimes even when just watching Youtube videos.

My specs:
CPU: AMD Athlon II X4 840
MoBo: Asus A68HM-K
GPU: Gigabyte GTX 1050TI single-fan
RAM: 1x8GB HyperX Fury Black 1600mHz
HDD: Boot: Samsung 300GB
Storage: Seagate Barracuda 750GB
PSU: (unsure because I didn't originally build the PC) 600W
OS: Windows 10 unactivated

I don't think it's an overheating issue, because temps seem ok in HWMonitor.