So iam installing my new fractal design n3 1000w and it got 2cables with(first cable)6+2 and 6+2 and second got same 6+2 and 6+2 iam just having a radeon hd 6780atm so it got 6+6pin so should i connect first cable 6+6 or first cable 6and second cable 6? Iam getting 2 radeon hd r9 280x next week. Should i connect 1cable each card then or?