Nvidia’s push toward sixth‑generation high‑bandwidth memory is igniting one of the most closely watched component battles in AI hardware. According to ETNews, the chipmaker is evaluating HBM4 samples from SK Hynix, Samsung Electronics, and Micron, with testing slated to wrap up by mid‑November 2025. The outcome will decide who wins supply orders for Nvidia’s next‑generation AI accelerator, Rubin, which is planned for the second half of 2026.
Why this matters
HBM4 is expected to become the backbone of future AI compute, feeding massive models with the bandwidth and efficiency they need. Memory speed and capacity are now as critical as raw GPU performance, and the suppliers that meet Nvidia’s criteria gain not just prestige, but long‑term, high‑value contracts tied to hyperscale data centers and enterprise AI deployments.
What Nvidia’s evaluation typically covers
– Bandwidth and latency under AI training and inference workloads
– Power efficiency and thermal performance in dense server environments
– Reliability, error rates, and long‑duration stability
– Compatibility with advanced packaging and interconnects
– Manufacturing maturity, yields, and ability to scale volume
The stakes for memory makers
– SK Hynix, Samsung Electronics, and Micron are racing to prove they can deliver top‑tier performance at scale.
– Securing design wins for Rubin could shape market share across the AI memory landscape for years.
– Capacity planning, long‑term supply agreements, and pricing will likely align quickly once Nvidia finalizes its picks.
What to watch next
– Official confirmation that HBM4 testing has concluded by mid‑November 2025
– Signals of volume ramp plans and capacity expansions at the chosen suppliers
– Early performance disclosures or demos tied to Rubin‑class platforms as the 2026 launch window approaches
Bottom line
Nvidia’s HBM4 selection will set the tone for the next wave of AI infrastructure. With a decision expected by mid‑November 2025 and Rubin slated for the second half of 2026, the memory suppliers that clear this bar will be positioned at the center of the industry’s most important build‑out.
