As soon as I open any game or put the card on load (about when the card hits 50 °C) the pixels look weird for a second and the screen goes black, the game crashes and some time the pc restarts. Idling and browsing(under 45-50 °C) the card works fine no problem. How can i make sure the GPU is dead so i can buy a new one? I dont want to buy a new one only to find out that's it's not GPU problem. My card is gigabyte gtx 770 2gb and it was running fine for 4 years but suddenly the past month this is happening always when it hits about 50 °C.