Anonymous
Anonymous asked in Computers & InternetProgramming & Design · 5 months ago

CPU made of millions even billions of transistors?

What happens to a persons computer or laptop if one of these transistors are damaged, is there a plan b, c, d, e etc path for the circuit to function normally?

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  • 5 months ago
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    Some part of it stops working.

    It may only affect something really obscure and not be noticeable except for some kind of erratic error - or it may just die.

    Various series of CPUs over the years have had alternate versions with parts disabled, like cache RAM or whole cores in dual- or multi-core devices shut off, as parts of the IC did not pass testing during manufacture.

    If I remember right, the first Intel "Celeron" series were Pentiums (or some series) with disabled cache, sold at a lower price.

    And some of the AMD FX four or six cores, 8 core devices with failed cores disabled.

    The idea goes back decades; I believe it was the Sinclair Spectrum that used faulty 64K RAM chip that had either the upper or lower half usable, as they kept the cost down.

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  • 5 months ago

    No plan B. If one of them pops its clogs, the whole processor is junk.

    During manufacture, for some chips, there are spare parts on the wafer that get enabled if the main part fails the test - but once that's done, you're committed.

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