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.