While in 25 or 10 man raids I see what I can only discribe as a possible artifact from gpu. Temps look fine. Here is a link to the screeen shot. If this is the wrong forums for this I apologize ahead of time.
http://i172.photobucket.com/albums/w25/gandolfmoogle76/WoWScrnShot_011512_211234.jpg
http://i172.photobucket.com/albums/w25/gandolfmoogle76/WoWScrnShot_011512_211234.jpg