Bad score when overclocking

[Joko2105]

Recently, I upgraded my cpu from i7 3770 to 3770K, also replace the stock cooler with Corsair H110i GT. I overclocked it in the bios to 4,5 Ghz. Ran cinebench on windows and I got around 730cb, when I ran it on El Capitan I got around 580cb.
What is the problem?
My system definitions is iMac 13.2
Thanks for the help!

 

[Joko2105]

I was able to fix it by switching system definition to Mac Pro 3.1 and by Enabling Generate P States in Clover Configurator
my current score in OSX is 767cb