Yes, that combo will be just fine, as the 6950XT was designed for 4K 60Hz gaming when it released, and is by no means a slow card, even today. Remember that large CPU gains you see in benchmarks are typically a result of 1080p, because margins between faster CPUs drops significantly at higher resolutions. That isn't to say buying a 9800X3D won't improve your gaming experience, but selling your card and investing in a newer one, (perhaps a Nvidia 5000 card) would improve your gaming experience far more than the 9800X3D.