It's also known as artifacting. Prior to blaming the GPU, might want to check back with us and list your full system's specs and your OS, like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
It's also possible that a lack of power to the GPU can cause it to artifact/BSOD/black screen or even the entire system rebooting when under load.