On my motherboard, the ASUS Z9PA-D8, it says that it has a row of 8 SAS ports for connecting to SAS hard drives.

I'm talking about the line of blue things running horizontally in the bottom right of the image. They clearly look like SATA III ports. And I can connect a SATA III 6.0 GB/S data transfer cable into them. But, when I go to connect them to a SAS hard drive, it doesn't work.

What kind of cable should I buy to connect from this port to a usual SAS hard drive?

On page 51 of the documentation, it calls them "PSAS connectors", but I don't know what that means, and it's not on the web. I just want to know how to get these SAS hard drives working with this board.