I also would like to know which psu to order for it.
This is actually a valid question in this case. Innosilicon has indicated they are not including a PSU with this miner in order to cut down the shipping cost. So we do need to know what PSU they recommend for the A4. I have sent that question to Innosilicon, but I have not heard back from them yet.
So the added cost of a PSU is not factored into the price we have been given for the A4. Just a heads up.
Maybe it is better, that PSU is not included. Last time (A2 110Mhash miners) their PSUs were disaster. After short time half of them were dead. They put inside usually some black noname OEM 1000W PSUs, but was needed at least 1100W, better 1200W.
But not all 1200W PSU is possible to put inside, because some of these are longer than free place. I used OCZ 1250W. Important is 6 independent PCI-E cables (not splitted). It is possible also use CPU ATX4+4 to PCIE adapter cable. Also not all previous Innosilicon hashing boards had the same PCIE connector. Some version 6 pin, some 8pin, some 180degrees rotated...