Engineer Questions HBM Stacking: Bandwidth Diluted to 20% at 20 Layers

An engineer argues that stacking DRAM to 20 layers dilutes HBM's average bandwidth to about 20% of a single layer—slower than DDR5—and adds that HBM stacks consume far more manufacturing capacity than equivalent LPDDR/DDR, questioning whether the route is justified.

2026-09-25 ~ 2026-09-25 · 4 related posts

• Engineer argues HBM stacks dilute bandwidth to 20% of a single DRAM layer — knowrohit07 · 2026-09-25
• HBM consumes far more manufacturing capacity than comparable LPDDR/DDR — knowrohit07 · 2026-09-25
• HBM eats far more manufacturing capacity than comparable DDR/LPDDR — is it worth it? — knowrohit07 · 2026-09-25

1 near-duplicate retellings: knowrohit07