They are normal (SATA) SSDs that work off PCI connected ports - http://rog.asus.com/308552014/labels/guides/ssd-guide-pci-express-m-2-msata-and-sata-express-the-differences-explained/
I read that article and it said I need a Sata express cable and a Sata express SSD. It said if I use a regular SSD that I will get the normal SSD speed if I use the Sata express port.