Not the setup, the issue is your absolute lack of knowledge. GPU based mining is not for people who aren't already familiar with PC hardware. It's best done by people who have built PC's in the past.
No one can help you with the questions that you have because they are VERY basic.
This also means you will not be able to handle the massively more complicated stuff about mining that you will have to tackle in the future once you have the system assembled.
So, I advice you to sell your hardware and buy an Antminer or buy coins and trade. Its more profitable anyways.
Hi deadsix,
Its basically you who created the confusion. As per your comments above, you stated:
That PSU has 4 PCIe cables that have 2 x 6+2 ends, for a total of 8 connectors. Plug in any the 6+2 connectors into the 8 pin slot on the GPU, leave the 6pin slot empty, Rx580's can work without it. So you can connect two GPUs on one cable effectively.
I was clear in my mind based on your proposition but some other member objected connecting two GPUs on a single cable.
So please don't put a whole blame on me and if you can advise positively then you are most welcome and I would be looking forward.
Regards,
Rizwan