i7 4790k showing up as 3 cores/6 threads, why??

[Tylerx23]

I just upgraded from a fx-6300 to the new devils canyon i7 4790k but when I started running benchmarks and opened task manager I noticed I only had 3 cores active, why? And how do I fix it?

 

[Sandstorm3000]

Could you make a screenshot of this?

It should show 4 cores or 8 threads.
Also, no one uses the name codename's of CPU's. (atleast i have never seen it) if you say 4790k its already enough

 

[rgd1101]

did you reinstall windows?

 

[Assassin0706]

Is the 4th core disabled in bios?