From the stated MH/S I suspect these are X6 models and not the older X3 units. I had a couple of them back in the day. Decent units for the time. Had to use quality 750 watt power supplies.
I did to at one time i had two sold them for 300 each made back then what they cost me when the S5 came out or around then when all the scrpt mining company's but one turned out to be one big scam and they became thieves and the X6 is the later model same chip as the X3 . all they did was under clock and under volts the X6 from a X3 it worked well before they started ripping others off with there so called 28 nm model that was suppose to top the A2 etc.