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The article refers to orders of 50000 or 100000 CPUs as so large that AMD might have trouble fulfilling them. Is it plausible? How long does it take to manufact

• jmole 6y ago
  The demand is already booked at the fabs. This is an extra 50-100k on top of that. Each chiplet (core complex die) on the AMD Epyc is 74 mm² plus the I/O die, which is built on a 12nm process is 125 mm². [0] There is roughly 70k mm² of area on a 300mm wafer. Let's say for math's sake that after yield loss and so on, we end up with 37k mm^2 of chips that work; That's 500 chiplets per wafer. Each CPU has 8 chiplets, so that's 62 CPUs per wafer. So 50k CPUs is ~800 wafers and 100k CPUs is ~1600 wafers. Cycle times for 7nm are ~80 days [1] So you have at least an 80 day lead time, plus whatever time is spent waiting for open capacity. TSMC capacity is said to be 130k wafers/month @ 7nm [2], so the volume needed is only ~1% of total monthly fab allocation. According to the same source, AMD already has ~20% allocation at TSMC, so it's 5% of AMDs total production for a single month for that order. [0] - https://en.wikichip.org/wiki/amd/microarchitectures/zen_2#Core_Complex_Die https://en.wikichip.org/wiki/amd/microarchitectures/zen_2#Co... [1] - https://semiengineering.com/battling-fab-cycle-times/ https://semiengineering.com/battling-fab-cycle-times/ [2] - https://wccftech.com/amd-7nm-wafer-production-set-to-double-in-2h-2020-7nm-capacity-at-tsmc-currently-fully-booked/ https://wccftech.com/amd-7nm-wafer-production-set-to-double-...