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HBM4 Didn't Break the Memory Wall — It Just Moved...
HBM4 Didn't Break the Memory Wall — It Just Moved It HBM bandwidth has doubled every generation. HBM2E (2020): 410 GB/s per stack — 1024-bit, 3.2 Gb/s/pin HBM3 (2022): 819 GB/s per stack — 1024-bit, 6.4 Gb/s/pin HBM3E (2024): 1.2 TB/s per stack — 1024-bit, up to 9.8 Gb/s/pin (JEDEC max, varies by vendor) HBM4 (2026): 2.0 TB/s per stack — 2048-bit, 8.0 Gb/s/pin Notice anything off? HBM4's JEDEC base pin speed is 8.0 Gb/s. That's lower than HBM3E's max JEDEC spec of 9.8 Gb/s (Samsung's implementat
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