Ok, i think i found the solution. Along with Intel Chipset driver i had to install Intel Matrix Storage Driver/Utility. After that all old IDE Device/IDE ATA/ATA entries in device manager are gone and replaced by Intel ICH10R AHCI Controller.
http://shrani.si/f/16/cS/1JHL008y/ahci.png
So i assume its now actually working in native AHCI mode (with included NCQ support). Because all those IDE and ATA modes seem to be some sort of compatibility emulations of native SATA drives.
Also pay attention to "Disk drives" branch. They don't have "ATA" appended anymore! Wooohoooo! :D
EDIT:
Just tested with HD tach. CPU utilization is 0% :D, sustained speed went up for 20MB/s. ENd drive speed is still pretty much the same.
It seems CPU utilization went down significantly and system itself seems to be much more responsive :)
I like this a lot :D