Need help i have a evga 500w 80+ with 20+4 pin and i have a i3 4130 and a H81 M-E with a 24pin connector and i have only a 20 pin connected ialso use a r7 250x but will be getting r9 270 soon i have 2 pcie 6+2 so will i need to connect the 20+4 pin or leave the 20 pin in??