Dear All

If thinking of buying this PSU for an S4 with the older M4 ring terminals, this is the reply I received from Bitmain.

Hello sir,

when you are making order,

you need to make a comment that you need M4 ring connectors. that way factory will prepare everything and ship.
but please be sure that they have understood you fully. and that you do not need bunch of 6 pins.

send them a picture if needed, that you require type 1 (m4's with one 6 pin). or red cables.
just be crystal clear. so they do not mix order.

Hope this makes it clear how to order

good luck