I'm new to this so take it easy 
I'm looking at overclocking my 2500k at the moment as I've been running it on stock since I bought it. I had a look at my motherboards "OC Genie" function and went into my BIOS to enable it. I didn't notice any difference at first so figured I had done something wrong it it just didn't work.
Then I looked and found this:
Windows is still only showing it as @ 3.30GHz 3.29GHz? But Core Temp shows it as 4190.87MHz screenshot below:
Which should I believe?

I'm looking at overclocking my 2500k at the moment as I've been running it on stock since I bought it. I had a look at my motherboards "OC Genie" function and went into my BIOS to enable it. I didn't notice any difference at first so figured I had done something wrong it it just didn't work.
Then I looked and found this:
Windows is still only showing it as @ 3.30GHz 3.29GHz? But Core Temp shows it as 4190.87MHz screenshot below:
Which should I believe?