I started to notice that the Crimson Drivers are underclocking my R9 280 3GB to 827 Mhz and it wont let any program override the lock. I tried using MSI afterburner and Clockblocker and it wont go above 827 Mhz. Temporary fix is a hard reset which resets the clock(not everytime) but after some time it will go back to 827 Mhz again.
I noticed this first when the first Crimson drivers came out and it only got worse with newer drivers. The newest drivers are aggresively locking my gpu to 827 Mhz.
I went back to AMD Catalyst 15.11.1 Beta drivers and everything is working fine but the Crimson driver has more fixes and FPS boosts than the catalyst.