If you've been at this for a while, then you've already discovered that nothing "official" has been ratified for P67 and IRST under windows 10.
I'm surprised that even windows update hasn't offered something more current than 2006, but I'm not there to see it. The 2006 date sounds remarkably like the "Msahci" default MS driver, which if this is the case, you never had installed any intel IRST drivers for the controller in the first place. What happens if you try searching for an updated driver in Device Manager by right-clicking?
The other thing to consider given the age of the system. If its working, and providing an acceptable level of performance verified using ATTO, Crystal Disk.. or your app of choice... is leave it alone.
"Standard SATA AFCI Controller" << I suspect this is a typo on your part and what you are meaning to say is "AHCI". Since updating and/or changing this driver incorrectly could render your machine unbootable 0x0...7B "Inaccessible Boot Device" error, be sure you have a back up, restore point or are comfortable manipulating the registry if you are going to experiment.