my power supply has the same, i used the 4+4 but i guess it doesnt make sense wich one you use. its cause there are mainboard with only a 4 pin connector thats why some psu´s have them both
The motherboard manual says 8Pin ATX, though I already have the EPS one wired in, and they look exactly the same, exept the ATX one is split into two 4 pin connectors, which really confuses me, since in the PSU manual it is refered to as "P4".