After buying a 570 and a 1060 card to try mining I am ready to build a dedicated rig and just ordered two 1070's.  Most of the build videos I have watched always seem to use newer motherboards (Prime 270's, 1151 CPUs...).  Since I have a G3258 and 2 4Gb sticks of Corsair ram just collecting dust I though I would just pick up an older 1150 motherboard and use that.  Is there any reason NOT to use an older motherboard?  I don't plan on adding more than five (or possibly six depending on which model I can find) GPU's.