● Covered by 3 sources · 3 reportsMedium impact3 neutral
IBM unveils mainframe chip supporting both Arm and Z workloads on same cores
Key points
- New IBM mainframe chip supports both IBM Z and Arm instruction sets.
- Each of the 11 cores can dynamically switch between modes.
- Enables running Arm-native Linux software with z/OS workloads.
- Utilizes KVM hypervisor for virtual machine dispatching.
- The processor was announced at Hot Chips 2026.
- All cores run at a 5.7 GHz base frequency.
- The processor is built on a 2nm node.
- The chip resulted from an IBM and Arm collaboration announced in April.
- The core switches between ISAs dynamically within nanoseconds.
- IBM claims 99.999999% uptime for the mainframe.
Dual-Architecture Mainframe Processor Introduced
IBM announced a new mainframe chip at the Hot Chips conference, marking a significant change in mainframe architecture. This processor is the first dual-architecture mainframe processor, capable of natively executing both IBM's instruction set and Arm's instruction set.
The chip will power the next generation of IBM Z and LinuxONE systems. It allows for the integration of Arm-native Linux software, including AI frameworks, with existing z/OS transaction-processing workloads on the same hardware.
Engineering for Instruction Set Compatibility
Instead of adding separate Arm cores, IBM engineered each of the chip's 11 cores to be bilingual. Each core can dynamically switch between Arm software mode and traditional Z software mode in nanoseconds, with no performance penalty.
This design enables mission-critical enterprise software to run alongside the broader ecosystem of Arm applications on the same chip.
Integration with Virtualization
The mechanism for switching between instruction sets relies on the open-source KVM hypervisor. Enterprises can run Arm64 Linux virtual machines and Linux on Z virtual machines side by side.
The hypervisor dispatches each virtual machine onto a physical core, and the core automatically flips into the corresponding mode.
Strategic Impact for Mainframe Systems
This announcement represents the first hardware milestone from a strategic collaboration between IBM and Arm, which was unveiled in April. The development addresses the challenge of integrating modern AI infrastructure, often built on Arm silicon, with the mainframe's role in processing regulated financial transactions.
The new chip aims to ensure the mainframe remains a relevant platform in an evolving technological landscape.
Updates
- The processor was announced at Hot Chips 2026.
- All cores run at a 5.7 GHz base frequency.
- The processor is built on a 2nm node.
- The chip resulted from an IBM and Arm collaboration announced in April.
- The core switches between ISAs dynamically within nanoseconds.
- IBM claims 99.999999% uptime for the mainframe.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
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How outlets covered it
IBM announced a new dual-architecture mainframe processor designed for future IBM Z and LinuxONE systems, enabling native execution of both IBM and Arm instruction sets. This development allows enterprises to run Arm-native Linux environments alongside z/OS and Linux on IBM Z, integrating the Arm software ecosystem with IBM's enterprise platforms.
IBM announced a new processor with a dual-ISA core that can natively execute both ARM and z/Architecture instructions, switching dynamically. This development allows IBM mainframes to run ARM software without modification, integrating the ARM ecosystem's software support with mainframe reliability.
IBM announced a new mainframe processor that can natively execute both IBM's instruction set and Arm's, switching between them in nanoseconds. This development allows enterprises to run Arm-native Linux software, including AI frameworks, alongside traditional z/OS transaction-processing workloads on the same chip.