I have a number of PSU from EVGA and have done some testing with powering 2 S5 Antminers from on PSU.  I found that the 80 Plus Gold EVGA 1300 Watt SuperNova does an excellent job powering two miners with fans on front and back of both.  Also the 1300 watt is fairly quiet and does not seem heat up too much.  I have found that the 1600 watt 80 Plus Platinum is a bit overkill and could probably power 3 Antminer S5's, but seems to get excessively hot just powering two.  While the EVGA 1600 watt 80 Plus Titanium runs two Antminer S5's and stays super cool and in ecco mode doesn't even need to power up the fan to stay cool.  What I found very interesting was that the older generation EVGA NEX 1500 Classified watt rated at 80 Plus Gold gave me about 15% to 20% more hashing performance.  The NEX Classified did run a little hotter than the Supernova 1300 watt but not as hot as the 1600 watt Platinum.  Also the dip switches allow you to power up without sticking a paperclip in the mb cable (something that always made me a little uneasy).  Also you can change it to single rails from 8 independent ones and with 220v overclock the psu to 1650 watts.  I don't know if the 20% boost in hashing power makes up for the slight inefficiency in power conversion but for me i always like to see faster hash rates.  Has anyone else seen other PSUs that seem to provide you a boost in hash rates?