Why are the max CPU base clock speeds are 4.0 ghz?

TheFinalEpic

Reputable
Nov 6, 2015
62
0
4,660
This always bugged me. I'm mostly a gamer and i sometimes render videos but thats it. Games greatly enjoy high single threaded performance, with future games scaling with quad cores and not much more than that.


I know not all GHZ are not made equal but the highest clock speeds have always been 4.0, with 2600k, 4790k, 6700k, etc. and they're always quad cores. (I know 6700k is only a tiny bit faster than i7 4790k and a tad fastrer than 2600k).


So my questions are:

Why cant quad cores or any cpu for that matter, have a higher stock clock speed than 4.0ghz?

Also why does 6 cores, 8 cores, 10 cores etc, never reach higher than the 3.0-3.5 ghz range? Why can't they have 4.0 ghz also?