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I think this "conveyor example" from Intel is a good explanation as to why: https://software.intel.com/en-us/blogs/2014/02/19/why-has-cp...

I think that you would cease to see any acceleration from increased clock speed unless you also sped up other parts of the processor / computer.

I think your sentiment is correct. If we can take advantage of higher clock speeds, then why not do it?

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Reminds me of something Seymour Cray (allegedly) once said: "Anyone can build a fast processor - the trick is to build a fast computer around it". Given the performance boost an SSD gives, I imagine there's some room left for improving overall system architecture without increasing the clock speed of the CPU or replacing the CPU at all.

(Caveat lector: Quoting from memory here)

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