AMD's stock is wild. It was around $2 just a few years ago and has been on a non-stop trend up to almost $60 today.
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What AMD is doing is really insane in my opinion. I'm not sure if they are pricing their processors low on purpose and/or if they have found a way to manufacture cheaper and/or Intel was screwing consumers with their pricing since they were so dominate.
No matter what, AMD is able to provide something that is measurably better and significantly cheaper than the incumbent, and if the blue ocean strategy holds, they should become the new incumbent in the near future.
Both. AMD uses chiplets for higher yields compared to Intel's huge monolithic processors (HCC, XCC), which lowers costs, and Intel jacked prices up because they had a monopoly.