GoKawiilIBM previews mainframe chip that natively runs both Z and Arm instructions
At Hot Chips 2026, IBM unveiled an early look at a future mainframe processor featuring 11 IBM Z cores on a 2-nanometer process, clocked above 5.7 GHz, capable of natively executing both z/Architecture and AArch64 instructions on the same cores without emulation. The chip will include specialized accelerators for AI fraud detection, I/O, compression, cryptography and sorting, plus a large cache hierarchy topping out near 3.5 GB of virtual L4 cache. IBM hasn't named the chip or its host system but expects it around 2028, likely powering a future z18-class mainframe.
GoKawiil's interpretation of the reporting above, not reported fact.
Blending Arm and Z instruction execution on identical cores could let enterprises run modern Linux, cloud-native and AI workloads directly beside legacy transaction processing without separate hardware or slow emulation layers. This positions IBM to keep mainframes relevant as Arm's software ecosystem expands, while preserving the reliability and security features that make Z systems attractive for banking and other mission-critical industries.
- IBM's chip runs Arm and z/Architecture instructions natively on the same cores, not via separate silicon or emulation.
- Built on a 2nm process with 11 cores clocked above 5.7GHz and massive multi-tier caching for transaction-heavy workloads.
- Expected around 2028, potentially as the basis for IBM's next mainframe generation after the 2025 z17.
Computer Architecture: A Quantitative Approach (Hennessy & Patterson) — If IBM baking AArch64 execution straight into Z cores makes you want to understand how instruction sets and core pipelines actually work, this is the classic text that engineers keep on the desk. Hennessy and Patterson walk through the design tradeoffs behind multi-ISA, high-frequency processors like the one shown at Hot Chips.
See Computer Architecture: A Quantitative Approach (Hennessy & Patterson) on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: techspot.com — Skye Jacobs, 2026-08-25
Published there as: “IBM is building a dual-architecture mainframe chip that will run Arm and Z software on the same cores”
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