The high power efficiency translates to big cost savings -- if one uses a secondhand general use PSU running at 83% efficiency, when compared to the APW3-12-1600 running at 93.8% efficiency, assuming an electricity cost of $0.10 per kWh, a user could save more than $150 USD per year in power fees.
Just to be clear in how this was calculate:
In 1 hour = 1.6 kW
In 1 month (744 hours) = 1,190.4 kW
1 PSU in 1 month @ USD$0.10 per kWh
1,190.4 x 0.10 = USD$119.04
Are my assumptions correct?