I have this problem as well. And the memory speed is also stuck at 1400MHz. R9 270, Win10, latest Crimson
Did you get information on how to fix this, razorbelarus? I already scanned the forums. Maybe I missed out on some.
Hope you had some luck and would care to share it to me. Thanks.
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I tried using DDU. Remove the old drivers and installed the latest Crimson 16.9.1. It's now back to normal.
Hope this helps.