If you had a cpu with only one transistor busted, I would pay you amazing money for it hahaha. Defectivity rates for silicon are fairly high especially for such a large die on small geometry. Typically 20% of the die is set aside for what are called repair arrays, so as long as you don't have too many bad transistors on a part, it's usually repairable. This isn't a user process though, most parts are repaired at the factory via fuse burn, but it's possible some motherboards are able to do soft repairs via scan chain. Even so, most of the time you're going to have some stuff busted and you'll almost never notice until you hit some corner case.
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