this is strange
Play games, as long as you want no issues
been playing Rust 3-8 hours at a time ( no life)
once i close the game, and go to desktop, get space invaders looking artifacts within a couple minutes 
Pc crashes
reboot, artifacts within 20 seconds to 1 minute.
loop repeats until pc is off for HOURS
5-10 minutes ( enough to cool down a card) not long enough
come back after a couple hours, game on no issues, until you finish gaming
 
Installed latest Nvidia driver
Reinstalled fresh new windows 10
same thing. 
 
 
updated drivers back in january and this started at some point after that, until then no issues with card. its NOT heat.