Mate, i am not an electrician, but i guess electricity dosn't care from what model of PSU they come, or am i wrong? 
I think PSU model is matter, becasue different model have different efficiency,so they will have different wattage at the wall.
that's why I prefer to use current at 12 volt DC that S1 need.
let say an S1 need 30 Amp, and it will always fix for any model PSU.
but for different PSU it will have different wattage at the wall.
Power/wattage S1 need = 12 volt x 30 Amp = 360 Watt
If you use PSU with 80% efficiency it will pull 450 watt at the wall.
If you use PSU with 90% efficiency it will pull 400 watt at the wall.
Anybody using Antminer S1s on Ghash.io pool? Just wondering what difficulty numbers you are using? I am using 256 difficulty, and getting some stales, duplicate, and low difficulty errors.
Q: What is stratum difficulty and what do I set there?Stratum difficulty is the difficulty which you set up for your workers to solve hashes. The optimal settings of the stratum difficulty depends on your hash-rate:
16+ GH/s - 16 difficulty
32+ Gh/s - 32 difficulty
64+ GH/s - 64 difficulty
128+ GH/s - 128 difficulty
256+ GH/s - 256 difficulty
512+ GH/s - 512 difficulty
1 TH/s - 1024 difficulty
