Hi i want to upgrade my pc's GPU but i dont know if i should go with the gtx 770 which has lower temps lower power usage and higher fps but th R9 has mantle and true audio. And i just want to know your thoughts if i should get the 770 or if you think mantle will be implemented in new games and give a fps boost better than the 770? Or is amd going to launch a new line up of graphic cards? I would be thankful for any thoughts and ideas