The 12-layer memory chips hit 16 Gbps per pin, putting Samsung ahead of SK Hynix in the AI memory arms race.
Samsung Electronics started shipping samples of its 12-layer HBM4E high-bandwidth memory chips on May 29, beating its own target of the second half of 2026. The stock responded accordingly, surging as much as 6.5% and outperforming the broader KOSPI index.
The numbers behind HBM4E #
Samsung’s new HBM4E chips clock in at 16 Gbps per pin. That’s over 20% faster than the HBM4 generation, which sustained speeds of 11.7 Gbps. Total bandwidth reaches 4.0 TB/s, a figure that matters enormously for the AI accelerators and data center hardware these chips are designed to power.
Samsung had already kicked off mass production of its standard HBM4 chips back in February 2026, becoming the first company to do so. The jump from HBM4 to HBM4E samples in roughly three months is an unusually compressed timeline, even by semiconductor industry standards.
The SK Hynix rivalry in focus #
SK Hynix is targeting HBM4E mass production for 2027. Samsung shipping samples now, in mid-2026, creates a meaningful gap. In chip manufacturing, a lead of several months can translate into billions in revenue, because customers like Nvidia and AMD tend to lock in supply agreements well before mass production begins.
Why this matters beyond semiconductors #
Samsung’s 6 to 6.5% share price jump on the announcement reflects market confidence that the company can maintain this pace. That’s a significant single-day move for a company of Samsung’s size, suggesting that investors view the HBM4E timeline as genuinely material to the company’s forward earnings.
For investors watching the semiconductor sector, the key variable to track is how quickly Samsung can move from sample shipments to mass production, and whether SK Hynix responds by pulling its own 2027 timeline forward. Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our