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> Ditzel explained, were running x86 servers with open PCIe slots, leaving Esperanto an opening to enter existing datacenters through a high-performing PCIe car

• sellyme 5y ago
  You've misread it. Here's those lines with a bit more context: > But if, instead, they followed the peak of the energy efficiency graph, the entire chip would consume just 8.5 watts [...] and operating at about 0.4 volts, Ditzel said, one chip would take about 20 watts. "the peak of the energy efficiency graph" isn't stated explicitly, but is at around 0.32 volts. Basically they want to use up all 120W of a PCIe slot, at the highest efficiency possible. They could have gotten higher efficiency (at 8.5W per chip), but that would have resulted in not being able to use the full 120W and thus actually having worse performance overall, even though it's more efficient.
  • zozbot234 5y ago
    > Basically they want to use up all 120W of a PCIe slot, at the highest efficiency possible. They could have gotten higher efficiency (at 8.5W per chip), but that would have resulted in not being able to use the full 120W Right, at the end of the day they were constrained due to not being able to fit more than 6 chips on a single PCIe card. If they could fit 14, they would've been able to make each chip use as little as ~8.57W while still using up the 120W available to the card.