ok well i have a refrence 7970 and i overclocked it a tad 970/1400 at stock voltage. and i just got medal of honor warfighter and thats when the artifacts started.....first it will play fine then after awhile it will start. i eliminated the motherbored,cpu,ram, and possible driver issues from the list. all i can think of is the gpu itself or my psu is going bad. im leaning towards the psu cause when i played bf3 before it worked fine then all of sudden bam with MOFWF. should i start the rma or should i reinstall windows to see if that will fix it???