Any way to disable cores on i7-4790k

[nimonster]

I want to compare the performance between i5 4690k and i7 4790k so is it possible to disable 2/4 cores and lower the clock speed so I can do this?

 

[Undying89]

What? All you have to do is disable Hyper-threading and your 4790k will become 4690k.

And yeah, there will be no difference.