As I said before,I tried to contact Sapphire via E-mail. I haven`t take mesures in the beginning,because I was using Windows 7 when I bought it. After a while I tried W8.1 and problems appeared.I thought it might be an incompatibility between GPU and MOBO or a Driver issue (this is why i contacted AMD & Sapphire),so I changed my board,but this still happens.The only thing I can do right now,is to remain at W7 until I change my GPU with an Nvidia. Why NVidia? Since I had AMD cards,I always had troubles with them,especially with drivers...So,I guess I will give Nvidia a try.