Thanks for the information. even I had done an inquiry with Promax7 and was amazed to know about the inbuilt inverter technology for less power consumption in both the miners of Promax 7.2 and Promax 7.1 each generating 3710 mhs and 1830 mh/s .I am highly impressed with the features offered by Promax7 GPU miners and I am planning to buy one.