I'm got one of the Onda 6 gpu boards with integrated CPU on the way, and need to get a power supply for it to power 6x 1060 3gbs.
I was thinking about using one of these EVGA 750w GQs
https://www.evga.com/products/product.aspx?pn=210-GQ-0750-V1Its got the 3x molex I need for the board, plenty of sata and 6x 6+2 pin connectors for the GPUs. Also 750w should be fine right? My other 1060s are pulling around 80-90w so seems like I'll sit around 80% utilisation.
My other thought is the one molex branch with 3x connections going to handle powering 3 slots? And should I run all 3 sata off one branch?
rule of thumb is no more than 2 sata used per string or 2 molex used per string.
I think this is it
https://www.evga.com/products/product.aspx?pn=210-GQ-0750-V1it has 4 pcie jacks
so to have 6 6+2
it may have 2 single head and 2 double head
or 0 single head and 3 double head.

Correct, it has 2 single head and 2 double head for the pcie strings, I already have one of the units powering 2 Vega 56 and 1 Vega 64.
I think should should be fine to power the 1x6 pin on each of the 6 1060 3gbs.
So if only using max 2x sata or molex per string, I am 1 molex connection short, unless I use a sata to molex adapter from a spare sata string?
if you have a meter and check the 3 sata jacks and the perf jack are the same.
so 4 jacks are good.
if you have 3 sata cables and 1 molex cable.
do 1 molex for two molex on mobo ------------------------------------------------- 2 mobo connections
do 1 sata for a sata on mobo and use an adapter to do the last molex ----------- 2 mobo connections
do 1 sata for a sata on the mobo
do 1 sata for a sata on the mobo
watch the 2 cables doing 2 connections do a little lower tdp in the beginning