1) Uninstall the device in Device Manager, check the "delete driver" checkbox.
2) Right click the Device Manager root node, "Scan for new devices", delete the new card entry and its driver, like in step 1
3) Repeat until you get the Basic VGA driver
4) Install AMD drivers from their installer
Hope that makes sense. Please let me know if this works
Tried it, but unfortunately the issue persists.
After this failed, I tried a different GPU-Z version, same result, I tried Display Driver Uninstaller and tried older drivers.
The result is the same.
I do not overclock/underclock/no under/overvoltage - but I decided to try it right now and clicked the "Undervolt GPU" button in AMD software and it shows the default/normal clocks. No other button helps with the 0Mhz readout. As soon as Undervolt is applied it shows clock speeds.
Everything works fine, game performance, benchmarks, etc - just this readout.
I didn't update or change hardware/bios/etc. The only thing I tried as a last resort was the undervolt.