The CEO says 1-1.5%. "Cerebras approached the problem using redundancy by adding extra cores throughout the chip that would be used as backup in the event that

The CEO says 1-1.5%. "Cerebras approached the problem using redundancy by adding extra cores throughout the chip that would be used as backup in the event that an error appeared in that core’s neighborhood on the wafer. “You have to hold only 1%, 1.5% of these guys aside,” Feldman explained to me. Leaving extra cores allows the chip to essentially self-heal, routing around the lithography error and making a whole-wafer silicon chip viable." https://techcrunch.com/2019/08/19/the-five-technical-challenges-cerebras-overcame-in-building-the-first-trillion-transistor-chip/ https://techcrunch.com/2019/08/19/the-five-technical-challen...