Help my computer randomly shuts down

[levinienstadt]

So I have two problems. 1, my computer will randomly shut down while playing a game (mainly CSGO or rainbow six siege) yet the fans will keep running, and 2, when I shut it down the monitor will shut down but the fans will again keep running. I have already tried replacing the PSU and updating drivers. I am at a loss for what to do now.

System:
GPU: NVIDIA GTX 960 (2GB)
CPU: AMD FX-9590
PSU: EVGA SuperNOVA 750 G3
Ram: a mixed assortment adding up to 20 GB (none are very good, 3 crappy 4 gbs and 1 8gb)

I think that is all the info I need to give and would love it if someone could help me out. If you need more info just ask me

 

[R_1]

have you tested the memory all together with memtest86, leave it go for three passes or overnight whichever takes less time.

My canned random reboot Rant
Random reboots are usually caused by the PSU, the RAM or software AND in that order of likely-hood.
PSU - If you can borrow/swap a PSU for testing. sibling/friend you can swap out the PSU and each system will be testing the other.
RAM - run the system with one stick of RAM see if stability returns if not Test all the RAM with memtest 86 for three passes or overnight. if you get no 0 errors after more than three passes the ram is good. with the random reboots I would suggest running this test after the PSU swap or after the PSU has been cleared.
Software - Drivers or other issues can cause reboots. Boot to a linux distro on a USB drive. mint linux will boot to memtest86. you can run the OS from the USB and await reboot.
end canned rant

 

[smorizio]

the shutdown is do the wattage of the cpu and the vrm of your mb. most of the 900 chipset mb do not support that cpu. i would swap it down for an 8000 chip from amd. on not shutting down if your mb is an asus mb the efi bios may be locked up. take power off the power supply and clear the cmos.