New SSD 250G SAMSUNG 850 EVO on ASUS P6X58D Premium Mobo. When installed on SATA 6 port on mobo, Samsung Magician shows AHCI as Not Activated. AHCI is active in BIOS and drivers are installed. Magician speed tests are slow. Here's the kicker. When I move the SSD to a SATA 3 port, Magician shows...