Backdate your PC to before you installed the new drivers then try to download a different driver from AMD's site as it may be the driver.
Ok I found a solution that works for me for the moment.
Remember the fps unlock solution? ( -GameTime.MaxSimFps 60 -GameTime.ForceSimRate 60+)
For me works like this: -GameTime.MaxSimFps 60 -GameTime.ForceSimRate 58+
It may be a driver problem from AMD but I say it again: my problem is ONLY on NFS Rivals. BF4 uses same game engine and runs perfect.
My solution gives a 2-3% unrealistic driving experience of course, but is not noticeable at high speeds.
You can try diferent values of course but keep in mind MaxSim needs to be higher than SimRate otherwise game wil run slow.
