I'm thinking about buying a new sapphire r9 280x toxic and it requires two 8 pin cables. My psu, a EVGA nex750 + 80 gold only came with a 6+2 pin and 6 pin. Is it ok to use a 6 pin to 8 pin adapter? I've been reading a couple of things and it seems like the answers are mixed. Could this damage my psu or gpu? Thanks.