You can use either one of the following for power:

1.) Barrel Connector to PCI-E; make sure the gauge of your cable will support approximately 40-50w of power running through it for prolonged periods of time. I recommend 18 awg or better. Note: the polarity for the barrel connector is: outer = negative, inner = positive.

2.) The screw 2-pin connectors to an adapted PCI-E power interface or some direct 12V powersupply. If buy some 2-pin screw connectors you can chain supply power up to 3 boards per PCI-E power cable. If you are using a server power supply with good gauge cable (example 14 awg), you may be ale to get away with more in the chain.  Note: The PCB should show which pair of the 4 pins are ground and which are VCC (power).

Also based on your picture, you need to flip the switch on unit for it to be "on". Forgot to add, each board will use up to 50 watts of power, so if you have 1TH of boards, I would plan to have a power supply capable of delivery atleast 1100w or more.


cheers