Most of the PSUs we offer are Platinum with 94% efficiency; this means a 6% loss.
For example, if your rig consumes 1000watt on the ZSX; at the wall, it would be a draw of 1060W. That might not seem like much, but if you have 1,000 rigs, that becomes 60kw x 24hr x 30days x 0.07cent and now you see why it matters.
One might think buying cheaper 18awg cables with gold- or even silver-rated PSUs will save money, but these can have a loss of up to 25%! Apply the math above with a 25% loss and you will be left with an extra electricity cost of $12,600 in just one month!