The Six plus two not for the mb but for your gpu power. There made to be keyed to gpu power. Your power supply should have an eight pin black cable or two four pin ones or a four pin one. If you have older ps with four pin plug it work fine on eight pin mb power plug. Just use half of the plug. The mb eight pin power plug is keyed and pinned.
yea this is for my gpu. Unfortunately, my cosair hx650 does not have a 8pin power, it only has 6+2 ... heres a picture of it
my question is regarding the orientation of the +2 part of the 6+2 connect