New build shutting down after heavy gaming, not over clocked, no overheating

mahatasin

Honorable
Jun 7, 2012
7
0
10,510
This is my build: http://pcpartpicker.com/user/mahatasin/saved/skF48d. This is my second thread for this issue, first I I though I am having overheating. Then replaced my stock CPU HS with 212 Evo. Still my computer is shutting down while everything seems normal, like the CPUTIN, and Core temperatures were under 40C when the computer suddenly shut down last night.

1. Ran Prime95 blend tests for about 2 hours - no problem
2. Ran OOCT CPU/Linpak/GPU/Power for about 2 hours/each - no problem
3. But playing games like Farcry3/BlackFlag/WatchDogs for an hour, then quit to desktop, then the computer shuts down within 3~5 minutes

When you quit a game, all the temperatures comes down quickly and in 1~2 minutes everything is in normal range, and then the computer shuts down - this is where I'm scratching my head!
 

mahatasin

Honorable
Jun 7, 2012
7
0
10,510
This problem resolve when using the onboard GPU instead of the GTX780. So I'm assuming its a GPU related problem. Could be MoBo issue as well, but since GPU is more expensive, replacing that item first.
 

mahatasin

Honorable
Jun 7, 2012
7
0
10,510
Power supply fan spins. Can this be a PSU overheating issue?
I will try to get a sense of how hot the air is coming out of PUS tonight. Actually I've played demanding games for 3/4 hours continuously without any issue, but after 3/4 minutes of quitting the games, the pc shuts down.