Hello geofelt, thank you for such a quick answer.
Then I have to stick with the 8gb, or... replace the mobo but since the system is working fine as is with 8gb, that would be a waste of work time so to speak.
I use my system mainly for 3D modeling (Cinema 4D), so C4D will have to be happy with its 8gb :-)
Thank you again, geofelt. I appreciate the fast reply very much.