Rubin's Downgrade Triggers Deep Memory Stock Sell-off, Market Views Summary: Potentially Only a Transitional Measure, Bullish for SSD and Optic Interconnect
June 5 — Well-known tech research firm SemiAnalysis roiled markets late Wednesday with a report revealing major adjustments to NVIDIA’s next-generation AI server cluster, the Rubin NVL72: per-cabinet memory capacity will plummet from the originally planned 55TB to just 28TB, and most Rubin systems will use 96GB SOCAMM modules instead of the initially planned 192GB units. The news triggered immediate sell-offs in memory stocks: Micron closed trading down 7.7%, while South Korea’s SK Hynix opened Thursday’s session with an 8.32% sharp drop.
Still, overall market sentiment leans cautiously optimistic, with many investors arguing the reaction is overdone.
US stock influencer Herman Jin commented that the memory downgrade boils down to supply constraints—not falling demand. He added NVIDIA’s upcoming switch-focused solutions may carry similar bearish headwinds, reiterating that model-side demand remains the critical gauge for whether the AI boom is nearing its end.
Other market observers
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a16z Total Withdrawn in Last 24 Hours: $15.156 million HYPE
June 5: On-chain analyst Ai Auntie (@ai_9684xtpa) reports that an entity associated with venture capital firm a16z has withdrawn a total of 224,118 HYPE tokens from major centralized exchanges (CEXs) over the past 24 hours, worth $15.156 million.
Since 2026, this entity’s total HYPE holdings have grown to 6.906 million tokens, valued at $322 million. With an average acquisition price of $46.7 per token, the position currently carries an unrealized gain of $131 million.
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Stock Market Circuit Breaker Triggered During Huang Renxun's Visit to South Korea, with the Latter's Itinerary Drawing Much Attention, Retail Investors Launch Self-built Tracking Website
**June 5 (Friday) – South Korea’s stock market plunged steeply Friday, tumbling over 5% amid sharp declines in SK Hynix and Samsung Electronics that triggered a midday trading halt. By press time, the Korea Composite Stock Price Index (Kospi) had widened its drop to more than 6%, with SK Hynix sinking 9%. The sell-off appears tied to two key factors: Broadcom’s AI performance guidance falling short of expectations, and a prominent research report projecting a significant reduction in Nvidia’s memory chip allocations.**
**Notably, Jensen Huang, Nvidia’s CEO and widely known as the "AI Master," is scheduled to arrive in South Korea on the afternoon of June 5. Given his recent recommendation of MRVL that boosted its stock price, the market had widely anticipated his visit would lift South Korean equities. As a result, local investors have launched websites to track Huang’s itinerary and analyze how his comments might impact stock prices.**
**Huang’s planned activities in South Korea are
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Fidelity Lowers SpaceX IPO Minimum Account Requirement from $500,000 to $2,000
June 5 – Fidelity confirmed via its official website that it has significantly lowered the participation threshold for SpaceX’s IPO (ticker: SPCX). Customers now only need to hold at least $2,000 in assets in their retail brokerage accounts to submit a subscription intent for the offering.
The firm’s special move to slash the threshold to $2,000 for SpaceX stems from the space company’s plan to allocate up to 30% of its IPO shares to retail investors—far higher than the roughly 10% allocation typical for most IPOs. This larger pool of shares available to public investors has made the offering more accessible, prompting Fidelity to ease the entry requirement.
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Zcash Founder Retrospects on Critical Network Vulnerability, ZEC Plunges Over 30%
On the morning of June 5, Zcash founder Zooko released a post-mortem on the critical Orchard vulnerability. The announcement sent ZEC—Zcash’s native token—plummeting more than 30% to a current trading price of $431.64.
Security researcher Taylor Hornby unearthed the critical inflation bug in Zcash’s Orchard pool on May 29, notifying the Zcash Open Development Lab (ZODL) immediately. ZODL then led an emergency coordination effort across the broader Zcash ecosystem, and the fix was finalized on June 2.
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