Can't find settings of Color Depth(DisplayPort) in crimson drivers

I used to switch Color Depth of DisplayPort in former Catalyst Control Center, I can switch the communication Color Depth of DisplayPort into 6,8,10 bpc.

Now I can't find it in crimson drivers both ver 15.7.3 and 16.12.1


So where is it now ?


Or is there any way else to  switch Color Depth , maybe modify registry or conf file way ?