Quote Originally Posted by Loth View Post
The 12V rail seems to be way out of spec on that power supply, which would explain why you see a shutdown when you put any stress on the system.

Exchanging the motherboard but keeping the HDD with system intact is not advisable, and if you do, you should run a repair option to get the correct drivers installed.

Also, clean out any old graphics related drivers and reinstall the newest driverset.
Trying with my good PSU

CPU CORE 1.287v
+3.3v 3.632
+5v 5.160VV
+12v 10.613
+5v standby 5.212V

While playing FFXIV