I am making a bitcoin (BTC) mining farm with 10 ANTMINER S5's.
https://bitmaintech.com/productDetail.htm?pid=000201412...

IMPORTANT: I don't have to pay for power so efficiency doesn't matter.

Specifications
Hash Rate: 1155 GH/s ±5%
Power Consumption: 590 W (at the wall)
Power Efficiency: 0.51 J/GH (at the wall)
Rated Voltage: 12V
Dimensions: 298 mm x 137 mm x 155 mm
Cooling: 1x 12038 fan
Operating Conditions: 0 °C to 35 °C

Notes
PSU: A power supply unit is not included, and you will need to provide an ATX PSU. There are 4 PCI-e connectors for +12V DC input and all four are required. Do not connect more than one PSU to the same hashing board.

I am going to be running these 24/7