What I do not understand is this sentence: "Dont parallel connected different DC input from different PSU into the same Hashing board." So does this mean you need two PSU if you're overclocking?
I think the logic behind this statement is that if one overclocks the S3 and uses two PSUs for some reason, each PSU must "exclusively" power the same blade (i.e. two PCIe connectors from one PSU should be connected to the two PCIe ports on one blade and not two PSUs each splitting PCIe power connection between two blades). This way, if a PSU fails, the other one would still be able to sufficiently power the other blade and keep it running and not be overloaded by two overclocked blades.