Mysterious reboots strikes again here are some fun facts 1) Issue seems to be related to DX9 , so far only games that gives me headache are Tera and Deadpool. FC 4,DA:I, GTA V , AC: Unity works without anything like this 2) While Tera goes wild completely random , Deadpool reboots seems to be replicable and related to plenty of action on the screen. 3) Issue is not related to OS . I just installed Win 10 TP ( 1000074) with newest driver just to check Tera and it rebooted same way in about 5 mins of gameplay 4) There is no power / utilization problem as FC4 eats almost every chunk of RAM/Vram avaiable and is working perfectly. 5) Issues in Deadpool can be bypassed by setting low graphic details. Tera still reboots no matter what I set 6) OC/DC doesnt change anything. 7) There might be something magical in the way how drivers are installed. When I did DDU in safe mode then rebooted and installed v348.08 then did the one required reboot it was working without reboot for few next hours then I shut down and went to sleep. Next day it wont let me play more than 10 minutes sometimes even reboots on the game loading. I'm totally out of ideas so please if anything comes to your mind say it.