Started my rig only a few weeks ago with 5 1070 GTXs. No problems so far. (It took quite a while to get riser cables - seems everyone is mining so it's not just lack of GPU cars that is a problem. I dual mine Eth & Sia. Eth makes the $ but Sia is rewarding because it produces so many coins per day. Hopefully Sia will go up some day and by then I will have a boat-load of them!