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Some people have issues with 13.1 itself, I personally experianced the EXACT same symptoms that you are experiancing
Changed drivers, and it was all gone.I do not know WHAT those errors are, But they are not harmful to your GPU if it is driver related.
Regardless i would do my best if i were you to try and remove them since they may be artifacts, wich are signs that your gpu is damaged when running at its current (artifacting) speed
I personally found that 12.8 and 13.5 are my favorite drivers
I own a 7950 in my main rig