2026 Samsung HBM4 vs SK Hynix HBM4 Complete Guide: 9 Critical Differences for Investors
Wondering whether Samsung HBM4 finally closes the gap with SK Hynix in the AI memory war that's defined the past three years? Curious which supplier Nvidia will lock in for Blackwell Ultra and Rubin platforms? After 22 years covering Samsung's memory business — and building competitive HBM models for institutional clients since the original HBM2 ramp in 2018 — here's my honest, no-fluff breakdown of the 9 differences that actually matter between Samsung and SK Hynix's HBM4 entries in 2026. Key Takeaways: 5 Things to Know About Samsung HBM4 vs SK Hynix HBM4 Bandwidth : Samsung claims ~2.0 TB/s per stack, SK Hynix shipping ~2.0 TB/s; performance roughly parity at announcement Capacity : both targeting 36 GB and 48 GB stacks (12-Hi and 16-Hi configurations) Process node : Samsung using 1c DRAM (~10nm class), SK Hynix on 1b — Samsung's smaller process is a meaningful structural advantage if yield holds Customer status : SK Hynix has Nvidia primary, Sam...