GA-965QM-DS2 (rev. 2.0) GA-965G-DS4 (rev. 3.3) AHCI is a programming interface for SATA host controller. It provides new features, such as NCQ and hot plug, to increase performance. If you want to enable AHCI, please kindly set " SATA RAID/ AHCI Mode" as AHCI in the BIOS. Aug 19, 2019 · Both IRST and AHCI should work, however, IRST is more new, while AHCI may be more stable. We would suggest sticking to default settings if it works for you, since if the options were reset in the future due to any sort of reasons, you will be safe from having to enter BIOS again to adjust the settings. Best Regards, GIGABYTE. I had a raid 1 set for my system running windows 7. I then saved up enough to get a Samsung SSD 850 Pro. Right now it is telling me that AHCI Mode is required for best SSD Performance.