I have 4 single fan MSI 1060 6GBs and they do just fine. All Samsung RAM. Rock stable at @64% power, -200 GPU, +900 RAM. Two runs with 65C at 58% fan and two 57C at 32% fan.  The average hash rate is 24.8 Mh/s.  If I push them to +960 RAM, they go over 25 MH/s no problem.