Panic over cycle peak intensifies as U.S. storage sector faces a 'Black Monday'

Sell‑off sparked by Google research and stretched valuations

U.S. tech stocks slumped on March 30, with the Philadelphia Semiconductor Index plunging about 4.2% and memory names bearing the brunt. Micron Technology (美光科技) fell roughly 9.9 on the day and is down about 30% from its March 18 peak; Western Digital (西部数据) dropped about 8.6%, while SanDisk (闪迪) and Seagate Technology (希捷科技) slid more than 6%. Across the sector more than $100 billion of market value evaporated last week, with Micron alone losing some $70 billion — a classic “Black Monday” for storage investors and a sharp reversal after a year of strong outperformance.

TurboQuant lit the fuse, but is the thesis sound?

The immediate trigger was Google’s (谷歌) publication of TurboQuant, an AI memory‑compression research claim that KV‑cache use in inference could be cut to roughly one‑sixth without accuracy loss. Markets instinctively read that as a hit to AI‑driven storage demand. Yet analysts quickly pushed back. Morgan Stanley’s Joseph Moore argued TurboQuant only targets inference KV cache, not model weights stored in HBM or AI training workloads, and Bank of America similarly called the decline an overreaction. Still, the mood shifted fast: high‑end DRAM and HBM demand is widely viewed as more resilient, while NAND‑centric names such as Kioxia (铠侠) and SanDisk may see a deeper structural impact, analysts say — and spot DDR5 prices have already shown notable weakness, with some consumer modules plunging as much as 30% in recent sessions.

Macro shocks, rumors and a testing moment for the sector

The sell‑off was compounded by broader macro and geopolitical pressures. Ongoing Middle East conflict has pushed oil higher, stoking inflation fears and the risk of tighter central‑bank policy — forces that typically hit cyclical tech stocks first. It has been reported that NVIDIA (英伟达) might scale back its Rubin Ultra plan from a four‑chip design to a dual‑chip rollout, a rumor that, if true, would further dent demand for high‑bandwidth memory and related components; industry contacts, however, say such reports have been repeatedly disproved in the past and urge caution. So which is it — a needed valuation reset or the start of a genuine cycle peak? Wall Street remains divided: some see a durable, AI‑driven “non‑typical” cycle beneath the noise, others warn of real demand normalization and a bifurcation between DRAM/HBM winners and NAND laggards. The market will decide, but for now the storage story has gone from strategic growth narrative to headline risk overnight.