Full system spec is:
CPU - amd fx8350 (8 cores) black edition
MOBO - asrock extreme 3
Psu- forgot the make but it's 600w
GPU - nvidia gtx 650ti (don't have boost, oops)
RAM - 8gb Kingston hyperx beast (going to get 16gb soon)
Hdd- 1tb seagate 7200rpm
Also how much of an improvements would a amd r9 280 be?