3 ms·

> cherry picking 5 out of 21 devices is in itself not a deal breaker IMO Might as well draw a straight line through a cloud of data points that look like a dog

• crote 1y ago
  It's a physical device at the bleeding edge of capabilities. Defects are pretty much a guarantee, and getting a working sample is a numbers game. Is it really that strange to not get a 100% yield? Having 5 working devices out of 21 is normal. The problem is that the other 16 weren't mentioned.
  • darth_avocado 1y ago
    Well you also need to account for what kind of deviation are we talking about between the 21. If they selected the 5 because they were the best, but the others showed results that were within say 0-5% of the 5, then sure that is acceptable. But if we’re talking about flipping a coin 21 times, seeing heads 16 times and then choosing the 5 tails outcomes as the results, then I would say that’s pretty unacceptable.
    • Panoramix 1y ago
      Like I said, a single misplaced atom is enough to wreak havoc in the behaviour of these things. That's not the problem, everyone knows there's a large gap between phenomena observed, and making it consistently manufacturable with high yield.
    • krastanov 1y ago
      I do not think this is the right metaphor. Having 5 devices work out of 21 is actually a better yield than what TSMC would get with a brand new process. This is not just normal, this is expected. It is all the other allegations that make this be a very questionable case.