How difficult would it be?
Creating a CPU
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Also curious.
Ahmed Mohamed could do it.
And by hand with a soldering iron too! He put those amateurs at Intel with their "chemistry" shit to shame.
You'd need millions, no, billions of dollars and a team of 1000 high energy chinks on call 24/7 working for you. Keep them warm with the heat generated by the bitcoin miners in the warehouse downstairs.
To do it alone? You would need to be Terry A. Davis Himself.
You mean designing one?
Designing a CPU is time consuming, actually building the CPU is extremely time consuming without automation.
You'll never build one in your garage powerful enough to compete with AMD/Intel due to their precise nano sized circuitry and 500+ million transistors, nevermind the security woes involved if you intend to distribute them. Depending how skilled you are in soldering creating a single prototype could take months to do. Actual products would take years to build by hand, and if you're not retarded hopefully its a low power design.
At best you could replicate a low end early 90s computer in processing power, build other computer parts and install linux on it.
lets ask this legend
youtube.com
If you mean designing one you could implement with a FPGA, then it's not harder than making kernel. The difficulty will rely on how complex you want the CPU to be.
You simply can't do it by hand, you require machinery.