I have a Hyper 212 Plus and I was able to hit 4.5ghz stable. The Artic Pro might be a little smaller but like previous poster said, you should be able to hit 4-4.2ghz.
As far as OC, do the following to yield the best temps.
offset leave it a +0.05
Intel Turbo Boost increment one notch at a time. Begin with +0.04 and work your way up.
Load Line Calibration (LLC) leave it on either 50% or 75% (Level 2 or Level 3)
Spread Spectrum Disabled
Everything else on Auto
Each increment run Prime95 Blend for about 15 min.
Using this method I was able to OC to 4.5ghz @ 1.186v with temps not going over 77c after many hours of full load on Prime95.
let me know if you have any more questions.