After some googling, I have half of the answer I'm looking for. I get that one end of the cable connects to the motherboard via SAS connector and the other end connects to the U.2. http://rog.asus.com/20322016/hands-on/easy-guide-to-ssds-sata-msata-m-2-and-u-2/ But do you have to supply power via a SATA connector or is it already supplied via motherboard SAS connector?