I do the overclocking from Bios, I believe that's the best way of doing it. i7 4770K OCed to 4GHz, with ASUS z87 Sabertooth. At first I was confused by what I was supposed to do but once the information and tutorials on how to overclock are read it's quite easy. Also have a very good cooler for your CPU, I paid for a Corsair h100i Watercooler, best investment yet.