My 1060 3gb versions can't do more than 18,6 Mh/s on Ethash algorithm... Bad RAM.. :/
I am using them on equihash with cca 280 sols/s, which is fine for 210$ card

What card brand/model, and also settings please! Do you know what power usage is?
pretty much even the Hynix crappy ones can do 280 sols @ 66% PL. I got a 3gb Hynix gtx 1060 Gigabyte WF2OC that does the same. The samsung 6gb ones can do 310+ on same clocks but increased memory speed. Equihash isn't as taxing on memory as Ethash it's better of mining Equihash on gtx 1060 with Hynix imo.