Cant overclock i7

[OC to 5GHz]

Hi everyone

I have a 2600k and a corsair h100 on an Asus p8z68-v pro

I am trying to overclock to 4.5ghz
Whenever I put in my multiplier, voltage etc , the target speed changes to what I
Want, but when I restart my pc , I only get 100mhz if not any increase

Does anyone know why?
Thanks

 

[amuffin]

Did you read the guide?
http://www.tomshardware.com/forum/274821-29-sandy-bridge-series-overclocking-cores-guide

Kinda disappointed that your name contradicts the speed you got your 2600K runnin at