Doesn't matter. It should work no problem.
I don't know what else to tell you.
Call EVGA tech support.
714-528-4500
If you register the power supply on EVGA's web site, first.... then you can get straight to 24/7 EVGA premium tech support.
/e Your motherboard manual says: you can use EITHER.... the 8 pin by itself or the 8 pin and the 4 pin.
Your power supply provides both of those choices.
This post was edited by Ghot on Jan 3 2017 06:04pm