Thank you for the help.
I'll be sure to throttle back the OC or cancel the OC.
My card was Oc'ed even more in the past (till a few days ago, I assumed it might have something to do with it).
It was core/mem 620/720 which proved to be unstable when benching it also.
Now it's still 540/648 so I'll be sure to check the results of this first, in hopes that the artifacts will lessen.
If artifacts still continue then I'll cancel the Oc completely.
Thanks again.