Thanks. Yeh i have done the usual, tried reinstalling drivers, tried different nvidia drivers, tried a complete reinstall of the OS, done malware scans and I know it's the GPU because my onboard GPU works fine. Will overclockers replace my card on this info or would i need to do more troubleshooting? I think the card has a factory built in overclock but i would not know where to start in underclocking it.
Have you tested your power supply? I had similar issues a while ago with my PSU and my HD7850. It kept happening, I tested the PSU in another rig and it did the same. Unfortunately, by that point it'd already fried the GPU and it had to be returned
Video I made for it:
https://www.youtube.com/watch?v=JrScZBj9hJ0
Crash happens a minute or so in.