This is my first build. Totally confused as to what i'm connecting to the mobo. From the PSU i have a 20 pin with another 4 pin in the same wire bundle. The 20 pin no doubt goes to the 24 pin socket (EATXPWR). Does the 4 pin from the same bundle fill the remain 4 pins of the EATXPWR? It definitely won't reach the ATX12V socket. Do i use a separate 4 pin for the ATX12V?