I have fx 6100 , asuis m5a97 le , r7 260x and this power supply http://www.chieftec.eu/en/psus/ps-2/smart-series/gps-400a8.html , i want to upgrade the videocard to r9 280x whitch it have 1x 8 pin and 1 x 6 pin , but i dont have the 6 pin , will an adaptor do the work ?