Well, the joke is you still have to supply your own PSU. And not only that, you'll also need to supply your own power supply on switch since the miner won't do it itself, apparently.
You use the on/off button on the PSU and attach one of these to the ATX plug, they are $1-$2 on ebay or make yourself
http://s11.postimg.org/xtjtc2x8z/atx.jpg
