I get the feeling that this is an issue with Crossfire and Freesync combo matt. I've seen plenty of ppl saying this new power saving feature is working much better, but these have all been on single card setups. Don't think I've seen one person so far saying anything about crossfire and this new driver and the clocks dropping yet.
Could be Tony, I'm keeping an open mind.
Unfortunately one of my Fury X cards died, so i can't test FreeSync CrossFire on my system. I'm not seeing any fluctuation with one Fury X and Freesync enabled.