Random restarts when playing more demanding games

Kaisendai

Honorable
Aug 18, 2013
11
0
10,510
Hi! So i've been having some problems with my PC lately. When playing more demanding games my coumputer restarts or completely freezes, that usually happens after an hour of gaming. My current setup is:

gtx 660 (few months old)
fx 6300 (few months old)
4gb ram
Chieftec 600W (1-2 months old)
500gb HDD (about a year old)
Dont remember the motherboard but it's quite new.

I tested my ram with memtest64, ran for 3 hours, no errors. Seems like an PSU issue but I'm quite short on money so swapping out parts just to test it is not really an option, Hope you can help.