Problem: Samsung Magician Software fails to recognize that the ssd was installed in AHCI mode, and also fails to recognize a SATA interface.
Background info: I recently bought a Samsung 840 pro 256gb. And proceeded to do a fresh win7 install as most people on the net recommend. I made sure to unplug my old HDD (which was on AHCI mode) before attempting to install windows. I double checked the bios settings and it was in AHCI mode.
Windows7 installed with with no issues. I then followed my routine of installing (using the mobo CD) all the important chipset and net drivers, wrapping it up with video drivers + Samsung Magician Software. I did a quick benchmark with the software and got respectable read/write (500/500 ish) results, my IOPS were in the 60k out of 90k claimed.
I ran the performance optimization, then the OS optimization, and even followed the recommendation to do an OP.
Then I noticed that after opening the Samsung Magician Software, under system information section, that AHCI mode was "deactivated" with a message that reads "AHCI mode is required for the best SSD performance", and that SATA interface was "N/A". As far as my limited knowledge goes you can't install an SSD in something other than AHCI or can you?
Right after noticing this issue I did a BIOS update. Nevertheless the "problem" persists, even after all sort of updates and reading as much as I could on the net to try and see whats up with it.
It is possible to run an SSD in IDE mode, it's just inferior to AHCI. If BIOS still says the drive is in AHCI mode, I'd say it's either a driver issue or a bug in Samsung Magician. A driver issue seems unlikely if you have done a clean install with all the right drivers.
AMD and Samung SSDs seem not to get along (equipment-wise). I had recently bought an HP Envy w/FX-6200 CPU + 840pro. The system was supposed to have SATA III ports but after the install, Magician showed speeds in the mid-200 range (SATA II-like). In fact it was Magician that advised system was not at 6mps speeds. I called HP and they blamed Samsung. Luckily my system was less than 15 days old so I took it back for a I7-3770 Dell XPS 8500 and now read/write both scream past 500 and IOPS both around 100K.
Maybe in my case the issue was really HP and not AMD.