hello I have an XFX 6870 it runs fine in hours of gaming even when it is ovreclocked to 980 core and 1150 mem. However when i run ati tool even at stock it artifacts like crazy. Is this a problem or is it just the drivers?? whats going on here any ideas? Im using 10.12 and all the games seems to run fine. MSI kombuster runs fine, and ive played crysis for about 2 hrs striaght with the overclock, any ideas??