Soldato
I've heard that these drivers don't fully utilize RDNA arch yet. If that's true then we might see a pretty noticeable bump in performance once they do. But as it stands right now any Aftermarket 3 fan cooler would allow you to make out clocks (at least on the 5700).
german toms hardware already stuck a 5700XT on water and it boosted to 2.1GHz, not rock solid stable but that could be driver or power delivery issues considering the ref cards power limit.