Problem with CPU multiplier

[Koxakis]

I have an Intel Core i5 750 witch I overclocked using the xmp profile. Before the overclock the CPU would reach x24 multiplier ( base clock 2.6 GHz and it reached 3.2 GHz as Intel's ARK website suggests for this CPU. After I did a factory reset the CPU only climbs up to x21 multiplier ( 2.8 GHz). The question is why the CPU is not reaching x24 multiplier after everything was set to the defaults? I am attaching a screenshot with the PC running prime 95. Thanks in advance ^.^ !!

 

CPU: Intel Core i5 750 @ 2.67 GHz

CPU Cooler: Noctua NH-U9B

MB: ASUS P7P55D

RAM: Corsair Dominator GT 8GB 1866 MHz C9

GPU: ASUS GTX 760 DC2OC 2 GB

PSU: Corsair HX 650 W

[Sauron]

You may have accidentally disabled turbo boost in bios.

 

@Koxakis by the way welcome to the forum! Please follow your topics

[Koxakis]

I checked the BIOS and the turbo mode option was set to enabled. I even tried to re-install the CPU in the socket. Thanks for the response !!

[Koxakis]

Also there is this problem it's not meant to go beyond 3.2 GHz how it is reaching 4 ? I doubt this is valid . Any thoughts? Thanks again in advance !!!