GPU or PSU

[Chris 2180]

Hello, I have been experiencing artifacts with my power color r9 280, can my PSU (thermaltake 750w smart) or my GPU be the cause?
I get the artifacts anywhere from the desktop to video games, and I also got some before windows loaded

My system
Powercolor r9 280
I5 4590
8gb ram
Thermaltake 750w smart

 

[Unolocogringo]

Definitely the GPU if the artifacts are appearing before windows loads. In bios or boot screen.