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HBM Explained: Why High-Bandwidth Memory Is the Real Bottleneck in AI Chips

Peak FLOPS are a distraction. The real constraint in every AI accelerator is how fast memory can feed the compute, and HBM is that constraint. Here is how it is built, why inference is memory-bound, why HBM4 doubles the bus instead of the clock, and why packaging, not silicon, is the supply

BitByteCore Silicon Desk · Jul 29, 2026 · 12 min read