use sata 3 connector (blue and black) on motherboard for ssd.  the white sata 1 is for odd and slower speed.   testing has agreed 100% with SATA-IO's statement that SATA 3Gb/s cables will work perfectly fine with SATA 6Gb/s drives.  SATA cables: Is there a difference? (pugetsystems.com)
What is this slot for on my Inspiron 3891? Could I maybe add a 2.5 SSD drive with bracket? [IMAGE]
What is this slot for?