I'm sorry for my English.
Phil, can you show photos of your rig with GPUs and wires?
I don't understand what 6 power sockets do in this board and how to supply the board by psu without 24pin socket.
Thank you.
it doesn't matter, just run it first for the future
Always hook them all up; BUT.....
you can use the first 7 16x slots with all but the last SATA power connector populated.... as I am doing with my board (v1.0) right now.
but furthermore;
Its recommended to just power them all.