Samsung HBM4 Yield Climbs to ~80%, Wafer Starts Up 40% as HBM4 Pricing Projected +65%
Samsung's HBM4 mass-production yield has risen from below 60% at ramp start to roughly 80%, enabling a plan to roughly double HBM4/HBM4E output next year and lift HBM wafer input about 40% from 180,000 to 250,000 wafers per month, with the HBM4-family share of that input rising from 40% to 80%. Despite the ramp from Samsung, SK hynix (M15X wafer input scaling from ~10k to 80k/month) and Micron, the market still models 2027 HBM demand growth of 56% against supply growth of 50%, with HBM4 contract prices projected roughly 65% above this year's levels.
A second qualified high-volume HBM4 source erodes SK hynix's supplier premium — brokerages have already cut 2027 SK hynix HBM operating margin assumptions from 80% to 60% — but it does not fix the shortage, so accelerator BOMs still absorb a steep HBM4 price step. Buyers of Rubin-class platforms (up to 16 HBM4E stacks per package) should lock 2027 allocation now, as dual-sourcing leverage will arrive faster than actual bit relief.
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