At 2W/GH you realize how big your electricity bill will be right?
What is the cost kWh in the location you are settings up?
278 S1 Ants x 180GH x 2W = 100,080W
Standard home user rate of 15c kWh = 100kW x 24hrs x $0.15 = $360 per day or $10,800 per month.
Buying the 1W/GH S2 would probably pay for itself pretty quickly with half the power cost and it will be a lot easier to deal with half the heat.
This is really only a little hobby, and project for me. I have access to cheap power, 7.5c per kWh and a large warehouse. I figure since I have the space and capacity, the only thing left is cheaper PSU, any suggestions?
I have read about using the dell server PSU, but there seems to be a lot of work with getting them to work.
I find the 1300W EVGA SuperNOVA G2 offer the best price per watt, 92% efficient, and it's rock solid with a 10 year warranty.
It can power 3x S1 Ants easy, even overclocked.