I was actually wondering about this. I have yet to get mine above 34 (having to unplug and replug the power in to do so). I was wondering if perhaps using a slightly higher wattage might raise hashing speed to the promised 37ghs. When I purchased mine I was told the recommended 12V 5A was insufficient to power these and had a 12V 7A power supply suggested. Instead I opted for the 12V 6A.