750W PSU for 6-7 cards? That's not enough. You will need PSU with 6-7 6pin PCI-e connectors, or PSU with some PCi-e 6pin and enough or Sata/Molex, so you can get power to graphic cards through some adapters. Each 1060's TDP is around 120W AFAIR. You can underclock them and decrease powerlimit to minimum, but you will still need 6-7 PCI-e connectors.
The idea is 2 PSU , one of 750 watts and other of 1000 watts , and of course, all the necessary adaptors. So which pool is better?? Thanks for the answer..