I probably did not understand did not understand your question correctly. If you want to use 2 power supplies, then use this adapter to synchronize the startup and shutdown of two power supplies.
Yeah, no.. nothing to do with 2 power supplies. I just want to power the board with a server power supply that only supplies 12 volts. BTC-D37 and BTC-S37 are almost identical to this one but they dont have the ATX 24 pin. Instead the motherboard runs off 12 volts only. I suspect the ATX connector isn't necessary to be used on this board but I don't know for sure yet.