The power supply's link to the motherboard was adjusted in the more mature AT and LPX expectations; AT and LPX had two very similar connectors that might be unintentionally interchanged by forcing different keyed connectors into spot, commonly leading to short-circuits and irreversible harm to the motherboard (the rule http://3d-printed-autel-drone-ac73951.mybloglicious.com/13976254/atx-psu-mounting-bracket-can-be-fun-for-anyone