some help with overclocking (first time doing it)

[eftapsixos]

hallo my system is the following :
Asus formula z
amd 8350
asus matrix plat 7970
g-skill 2x8gb 2400
corsair h100i

and im trying to overclock it using this guide http://rog.asus.com/216552013/crosshair-v-motherboards/guide-overclocking-fx-8350-to-4-8ghz-on-cross...
now,im doing everything that it says all the steps the same and i got this on first try:

the problem is that when i try to use prime after 10 seconds of use the cpu goes up to 66-67" and because of that i stop it to avoid anything bad...
what should i do??im complete noob on oc never done it before thx in advance

[HiVizMan]

The obvious thing is that your cooling is not quite up to the task at hand. You will need to reduce your Vcore and see if a) your system is stable and b0 what your temperatures are.