Damnang
· Damnang’s Substack
· May 12, 2026 at 06:33
· ⏱ 11 min read
| Read on Substack ↗
Summary
HBM pricing power, not just total demand, will determine whether memory stocks continue their rally. The article argues that HBM's high cost (47% of NVIDIA's GPU BOM, 30% of hyperscaler capex) creates a wafer allocation tension: memory vendors face an unprecedented opportunity cost as conventional DRAM prices surge 90% QoQ, making HBM less attractive per wafer despite multi-year contracts. The key variable to watch is the 'captive ratio'—the share of AI memory demand that must stay inside HBM—which determines whether memory vendors can maintain pricing power.
•HBM accounts for roughly 47% of the BOM cost of an NVIDIA B200/B300 GPU (estimated $3,000 of $6,400).
•Hyperscaler memory spend as a share of capex has jumped from ~8% to ~30% in 2-3 years, reaching an estimated $217B in 2026.
•Conventional DRAM contract prices rose 90-95% QoQ in Q1 2026, a far cry from the typical 13-18% in strong upcycles.
•SK hynix posted a 72% operating margin in Q1 2026, with the primary driver being conventional DRAM ASP rather than HBM.
•Samsung acknowledged that conventional DRAM profitability exceeded HBM in Q1 2026, highlighting wafer allocation tension.
•HBM's per-wafer economics require an ASP roughly 4.5-7.6x higher than DDR5 to compensate for 3-4x wafer consumption and lower yields, but the gap has narrowed to 4-5x or less.
NVIDIA is cited with $68B quarterly revenue and $78B guidance, indicating strong demand. The article highlights that HBM is 47% of GPU BOM, driving NVIDIA's strategy to disaggregate inference to reduc
NVIDIA is cited with $68B quarterly revenue and $78B guidance, indicating strong demand. The article highlights that HBM is 47% of GPU BOM, driving NVIDIA's strategy to disaggregate inference to reduce HBM dependency. This cost pressure is a challenge, but NVIDIA's ability to adapt architecture and maintain margins is a positive signal for its long-term competitive position.
Risk: If NVIDIA fails to reduce HBM dependency or if HBM costs continue rising, margins could compress, and the stock could face headwinds despite volume growth.
Micron is explicitly named as having 3-to-5-year strategic capacity agreements with customers, locking in HBM revenue visibility. However, the article warns that surging DDR5 prices create a wafer all
Micron is explicitly named as having 3-to-5-year strategic capacity agreements with customers, locking in HBM revenue visibility. However, the article warns that surging DDR5 prices create a wafer allocation opportunity cost, potentially pressuring HBM pricing power. The net effect is positive for revenue visibility but warrants monitoring margin dynamics.
Risk: If conventional DRAM prices remain elevated, Micron may shift wafer allocation away from HBM, potentially exacerbating HBM shortages and limiting HBM revenue growth.