I have noticed that most processors do not exceed about 4.5 GHz, is that the maximum number of GHz you can have in one processor? Also, how many processors can you pack together in one "clump" there are duo-cores and quad-cores but what about tri-cores, and hex-cores and such?
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The smart people are not always the ones who are right.
If you make a grammar mistake, I will probably point it out.
Hertz is just a measure of how many times something happens within a certain time-frame. It is a measure of frequency, not something you can "have in a processor". 4.5GHz is not a maximum at all, most CPU's simply just don't run cool enough, or there are other limiting factors. Not to mention that the frequency a certain CPU runs at isn't really a good indicator of performance anyway. As for number of cores, it once again comes back to what is practical, how many you can fit on a CPU without having it overheat, etc. There are quite a few hexa-core CPU's, some more recent ones would be in AMD's Ryzen lineup. Tri-cores are pretty rare nowadays though. Other than that, octa-cores are becoming more frequent, and for workstation and server processors it isn't really hard to find CPU's with 10+ cores.