You seem to have the same problem no matter what card you use. I suggest you stop fiddling with Wattman settings and if you are using any graphics controller apps..delete them (Afterburner,Trixx,MSI,Asus,etc)
You've got the infamous AMD 501 bug. It's been around for over 9 years without a solution. I had it on my 4870X2. Turning off hardware acceleration won't help. Sometimes it will disappear on it's own. Sometimes a clean install of Windows works. I never got it permanently fixed.
Now that I think about it I seemed to have a bit of success disabling ULPS. Google it for instructions on how to do that. There was a registry hack you had to do but I'm pretty sure there's a little program that will do it for you now.
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I found the issue on my end, but it might not work for others.
I use Discord, and when I watch a video embedded through Discord that's when my clock speeds get stuck.