I paid for 2 C1's. Just waiting for them to get shipped to me. I'm in the US. Already have the power supply and extra coolant. I've used the Corsair RM1000 on my KNC and it is a flawless power supply. I'll be using that power supply. If there is no electrical issue of using the supplied harness then I'll just use it. I assume it just plugs into one of the plugs on the top of the C1. This is my first antminer, so I don't know much about them or where power connections are, etc....I actually see 4 PCI-E connectors on the C1, but only 2 are needed to power it I guess? And I'm surprised you found that 4pin block. I searched that site and couldn't find it! You must have better search capabilities then me. I'm just getting impatient, because I want to be up and running ASAP.
If unsure, see excessively excessive guide:
https://bitcointalk.org/index.php?topic=846095.0Or...we could just answer the questions:
1: 4 PCI-e connections (6 pin) are required -- one for each of the four mining boards. There are a total of 8 PCI-e connectors (two on each mining board)...you just need to use one on each board to run at stock speed....so fill up one "slot" of 4 PCI-e connectors on top of the miner.
2: Check out the harness carefully, I cooked at least two resistors on a board and killed a fan header because one of my two harnesses was bad. I may do some reflow work to replace the resistors, but in the interim have replaced the harness with a few 4 pin fan splitters from the working headers.
3: No, you have to remove the miner's cover to plug the provided wiring harness (or a replacement splitters / harness) into the 4 pin fan headers on the mining boards...I have already suggested that this sucks and should be an easy improvement for BitMainTech for future C1s. That said, it's just 10 standard phillips head screws to undo and pull the cover off to get to the fan headers.
4: The RM1000 is recommended, but I assume you mean one RM1000 for EACH miner...right?