I have a 6800XT, no new drivers are needed just update to CSP 0.1.76 and in CSP settings you turn it on and select which quality you want to run. The FPS boost depends on which quality you choose and the larger the resolution the better it works so amazing for VR. I run it at Ultra Quality and all I can say is, for example, the difference on LA Canyons is night and day. Before, the distant mountains were blurry and the vegetation not sharp. Now it is all clear and I can see the road winding up the canyon 5 kms in the distance whereas before I didn't even know it was there.
I get an even greater boost by editing the PPFilter to only having the brake lights enabled, turning off FXAA and disabling post-proccessing antialiasing in CSP-Graphics Adjustments as the FidelityFX takes care of all this.