Gotta be the voltage settings in bios. What voltage are you running the cpu at? Do you have turbo enabled? Are you using the stock cooler?
Here are my voltage settings for 4.5ghz. There are only a couple of voltages you want to leave on auto. Remember also my voltage settings do not mean they will work for your cpu, you may have to tweak some up or down some.
AMD 8350FX 4.5ghz//Asus Sabertooth 990FX R2//Zalman 9900Max//4x8gb Corsair Vengeance 1866//90gb+240gb Corsair Force GT ssd//WD 250gb Scorpio Black//PNY GTX680 sli//HP w2408h//Corsair hx1000//Antec 1200//Win8 x64
12:10 AM by