Happen the same thing to me with and rx 5700 xt: 1850 mhz selected and instead the software show 1846. And 1850 now is the minimun value of the vram clock instead 1750.
Installed the 20.11.3, the failure keeps happening to me, I always uninstall the drivers with DDU and the memory clock does not indicate the correct speed and I do not know if that is really its speed.
The failure continues to occur but now I have noticed that the clock of the gpu does not reach the maximum for my card, there are already three versions of the controller with the same problem, I will continue with the 20.11.1 that are stable and give me the correct information.
-650W 80+ bronce ,I don't remember the brand now.
-Asrock B450M Pro4.
-Ryzen 5 3400g.
-Team group T-Force DDR4 3200mhz.
-Power Color Rx 5500 Xt 8Gb.
-Chipset Driver: Revision Number 184.108.40.2068
Exactly the same thing happens to me, I suppose that I will have to continue with the drivers 20.11.1 which show the correct information of my gpu