I have its big brother, the 6600K 4 x 3.9 GHz and I am very satisfied. Wanting to make a PC "reserve but not as powerful as the first one, I opted for what 6400K. The result was above my expectations, it may be a little less effective than 6600K, and this is normal, but it really well pulls the pin of his game and is a good enough power to not many things without any problem. So I just advise if you want a functional PC and without paying a fortune.