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SK hynix's[1][3] newsroom release is datelined "Seoul, September 12, 2025" and TrendForce[5] reported it the same day (2025-09-12).On 12 September 2025 SK hynix announced it had finished developing HBM4, the sixth generation of high-bandwidth memory, and prepared mass production, with double the bandwidth of the previous generation and more than 40% better power efficiency.
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