This will be fine up to 4.6GHz, after that many variables start to come into play. If your case airflow is really good with a fan above the VRMs and socket with another to the left at the back of the case then perhaps you may be able to get 4.8GHz on a good motherboard like the Sabertooth R2. I really don't think you'll be able to hit that, but I believe 4.6GHz is do-able considering I've reached it with the stock cooler. Another option for you is to attach a plate to the back end of the socket on your motherboard. You'd want to use a really dense steel, like D2, that's cold to the touch to help draw heat away from the socket and stabilize the temps. Some may find this to be too much work, or unorthodox, but coming from a guy who builds...