IBM unveils first dual-architecture mainframe chip with Arm: 2nm, 11 cores at 5.7GHz

DavidLinthicum · x · 2026-09-13

• IBM this week announced the first dual-architecture mainframe processor for IBM Z and LinuxONE, built in collaboration with Arm.
• Each core natively executes both IBM and Arm instructions concurrently, on a 2nm node with 11 cores running above 5.7 GHz.
• The chip integrates on-chip AI inference accelerators and dedicated I/O processing, bringing the large Arm software ecosystem to the mainframe.
• The author argues IBM is undervalued in the AI rally and poised for new highs (self-described non-analyst take).

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