HBM4 Squeezes DRAM Supply as Samsung and SK Hynix Inventories Drop Below 10 Days
nashnova research
Samsung and SK Hynix memory inventory has dropped below 10 days of supply as HBM4 production absorbs wafer capacity, squeezing conventional DRAM — opening a price-inflection watch window.
Inventory below 10 days — why does that matter?
KB Securities reported on September 7 that Samsung and SK Hynix memory inventory has fallen to under 10 days of supply.
This means → the two largest memory makers have almost no supply buffer; any demand spike or production hiccup would expose a gap immediately.
In plain terms = the warehouse holds less than 10 days of product — virtually hand-to-mouth.
What is draining inventory so fast?
AI infrastructure spending is pulling three categories at once — HBM (high-bandwidth memory), server DRAM, and enterprise SSDs — all surging simultaneously.
HBM — ultra-fast memory purpose-built for AI chips — is the single largest source of incremental demand.
This means → it is not one hot product; every memory component on the AI chain is tight, and inventory is being drawn down on multiple fronts at once.
How exactly does HBM4 squeeze conventional DRAM?
HBM4 — the next-generation high-bandwidth memory — requires heavy use of wafer capacity (the silicon discs from which chips are cut).
When a fab allocates more wafer starts to HBM4, the capacity left for conventional DRAM shrinks directly.
In plain terms = a production line has a fixed total output; HBM4 cuts in line, and ordinary memory loses its share.
What comes next?
The key variable: whether inventory can be replenished while demand keeps expanding.
If inventory stays at these lows, upward pressure on DRAM prices intensifies further.
This reflects a shift from cyclical swings to structural tightness driven by AI — the framework for reading DRAM pricing is changing.
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