Answering more for other people to be able to find this.
I asked by PM and was informed that changing the Bit Rate to 8.1GHz (HBR3) is only available with workstation graphics cards and not with gamer cards.
(Reason I asked despite the existing fix: while 10bit is now fixed, choosing 12bit still behaves exactly like 10bit previously did. BENQ EW3270u/RX480/DisplayPort)
I'm using mini displayport 1.2 for monitor . Can't get 10bpc with RGB444 but can get 10bpc with YCbCr422. My monitor support 1 billions color but only RGB space so when using YCbCr422 color seem weird The driver is 19.8.2 ... it have been months since i bought Radeon VII and did not get 10bit depth though Radeon VII can and my monitor can Anybody help me with this .... Windows 10 1903, Samsung Space Monitor LS27R75
You might check out this thread: solved. There is a lot in the thread as it spans more than a year's time, but in May 2019 it appears that AMD resolved this issue for many. Maybe you'll find some help reading through it.
I have read all. When i see your reply i read all again and I find out that 10bit 444 only support for 60Hz,100Hz and 120Hz not 144Hz. Thank you