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South Korea's other massive memory chipmaker, SK Hynix, plans to sell $28 billion in stock in the U.S. later this week, even as waves of volatility batter the chip shares.

Why it matters: The offering will be a major test of whether investors are still gaga for memory chip stocks.

The big picture: SK Hynix — along with Samsung Electronics, Micron Technology and Kioxia of Japan — is among the memory chipmakers whose valuations have exploded over the last year, amid a surge in AI-related demand.