Yup, got my 3570k to 4.4 GHz within 2 hours of testing, probably could go to 4.6 or 4.7, just haven't had any reason to push it yet. Good luck! Get another fan for it though, and go for a push/pull config for the best temps.
+1 to mclovits. I have the Hyper212 plus (same thing, slower fan) and I easily get my 2600k past 4.6Ghz with it on a fixed voltage. I get nice temperatures as well. However I did take that stock fan and toss it in the bottom of the case to cool my power supply and I bolted some high performance fans on it. It did make quite a difference on the temperatures but that stock fan could easily make it to 4.2-4.4Ghz
It means a fan on either side of the cooler, I would keep the stock fan and get on of these: http://www.newegg.com/Product/Product.aspx?Item=N82E168... to put on there. The stock fan could be used as a chassis fan if you prefer, but the fan above is almost identical to the stock fan, and it's the same type as the one on the Hyper 212+.