try to take a look at the market section, plenty of psu there, you need one 750w to be safe, better if it come from a good brand, don't buy cheap psu please, they can toast your miner
Seriously, S4 consumption is 1400watt, not 700 watt.
yeah you are right, i confused it with the s3 which is 600, never said it was 700, i just said that you need a 750 for a 600 consumption, so for 1400 a 1500 corsair would be enough