TrendForce analysis reveals that HBM4 validation for NVIDIA's upcoming Rubin platform is expected to complete by 2Q26, with Samsung, SK hynix, and Micron all advancing toward certification. Samsung is projected to secure validation first due to its product stability, while SK hynix and Micron are expected to follow shortly after. This three-supplier ecosystem aims to prevent NVIDIA's over-reliance on a single memory provider.

The rapid expansion of inference AI use cases has strengthened demand momentum since late 2025, with North American cloud service providers accelerating AI server deployments. NVIDIA remains cautiously optimistic about Rubin's commercial prospects, though the broader memory shortage has intensified. Conventional DRAM prices have surged since 4Q25, narrowing HBM's historical profitability advantage and forcing vendors to recalibrate capacity allocation between HBM and standard memory.

Memory vendors face complex design and validation uncertainties across generations, requiring continuous advancement of product roadmaps to avoid missing market opportunities. TrendForce expects NVIDIA to incorporate all three major suppliers into its HBM4 supply chain, with Samsung beginning phased mass production following 2Q26 validation completion. This multi-supplier approach ensures supply chain resilience for Rubin's ramp-up while maintaining competitive dynamics in the high-bandwidth memory market.