I tried to download the manual but the file was corrupted. In the specs they say there are AMD SB950 controller : 6 x SATA 6Gb/s port(s), red. Since your SSD is plugged in already I would look for a different group of red SATA ports and try to pick out SATA0 or 1 (whatever is lowest). Also is should be set up in ahci mode. You may have to do some registry tweeks to change it. Give it a try and tell us what happens.
Tried to move it to other port and set to AHCI mode. Still the same