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Those processors apparently have a 100% yield rate in production because a small percentage of cores are only for redundancy and can balance out small defects. The actual distribution of the software and the flow of data is handled by the compiler later.

Don't know much about the development costs though.

Edit: I got those infos from a YT video[0], which talks a bit about it and the second generation of the chip

[0] https://www.youtube.com/watch?v=FNd94_XaVlY






If I remember well Intel did something similar with the i486sx - most were just i468DX with a faulty i487 coprocessor disabled.

Not sure how they did it. Probably burning the SX microcode after testing?




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