I'm trying to set up a Samsung 830 on a 6 year old Asus motherboard with Windows Vista. I have SATA set to AHCI in the BIOS, and Windows installed fine, but Samsung Magician tells me that it's not running with AHCI enabled. I checked the benchmark because it was very slow (like a hard drive) and indeed the random IO numbers were much too low (but sequential was fine). Is there something I can do to enable AHCI properly? Should I try to update the BIOS or is it a Windows setting?