i have my 1060's set at 58% power limit and they run under 70 watts therefore i use unpowered 30cm 16-1 risers, also use them on 470/570 which run about 100w. this is because they get their power from psu and there are 4-pin connectors on the motherboard. i've had no problems with risers. i think usb risers are only needed on higher power cards and motherboards that don't have the additional power connectors.