Anybody maybe with an XMAS present ?
I got an answer for one question, which is ISRT does support acceleration of a secondary HDD. So this works.
However, still no success with getting the acceleration tab to show up.
AFAIK you should have at least two ordinary hdd in RAID configuration and an SSD acting as a cache to realize that feature. Try searching "SSD cache" using google.
So finally this topic is solved by an update of the BIOS, which finally gave me the acceleration button.
What in the end sounds easy was a looong way of testing.
To clarify a few things and help everybody here:
1) It is not necessary to have two HDD in RAID as said before. ISRT work on a single HDD with a SSD.
2) It is possible to have a SSD as the boot drive with the OS installed and have a secondary HDD accelerated by another SSD
3) The system BIOS has to be set to RAID mode
4) You do not have to re-intall the OS if you initially installed in IDE or AHCI mode. You can switch to RAID mode by a registry hack.
Hope that helps.