https://www.techpowerup.com/223981/...confirmed-works
AMD Releases PCI-Express Power Draw Fix, We Tested, Confirmed, Works
Here you can see that the new driver adds about 2.3% performance, which is a pretty decent improvement. Once you enable Compatibility Mode though, performance goes down slightly below the original result (0.8% lower), which means Compatibility Mode costs you around 3%, in case you really want to use it.
I do not recommend using Compatibility Mode, personally I don't think anyone with a somewhat modern computer would have run into any issues due to the increased power draw in the first place, neither did AMD.
It is good to see that AMD still chose to address the problem, and solved it fully, in a good way, and quick.