First look: IBM is creating a mainframe chip designed to run Arm software program instantly alongside IBM Z and LinuxONE code. The method might let clients add Linux, cloud and AI purposes whereas holding core transaction workloads on the identical system.
The processor was showcased at Scorching Chips 2026 and is anticipated to make use of 11 IBM Z cores constructed on a 2-nanometer course of. IBM mentioned the cores will function above 5.7 GHz and help native execution of each z/Structure and AArch64 directions.
That is the central change right here: IBM is not inserting separate Arm and Z cores on the identical chip, and it is not utilizing emulation. As an alternative, Arm instruction help is being constructed instantly into the mainframe core, with every processor core in a position to run Arm directions concurrently with IBM Z or LinuxONE directions.
The design might make it simpler for purchasers to run Arm-based Linux, cloud-native and AI software program alongside mainframe purposes that deal with core transaction and database workloads. IBM mentioned it needs to mix the attain of the Arm software program ecosystem with the scalability, safety and high-availability options related to Z and LinuxONE.
The chip will even embody a set of specialised accelerators. IBM plans AI inference {hardware} for in-transaction fraud detection, an information processing unit for I/O acceleration, and separate accelerators for compression, cryptography and sorting.
Its cache system is substantial: IBM disclosed a 36 MB non-public L2 cache, a 432 MB digital L3 cache and as a lot as 3.5 GB of digital L4 cache, assets meant to maintain latency low for giant databases and transaction-heavy workloads.
IBM hasn’t named the processor or introduced the system that may use it, however the firm mentioned it expects the design to reach in 2028. IBM launched its present z17 mainframe technology in 2025 and has usually up to date the platform on a three-year schedule, making the chip a possible candidate for a future z18 household.
The announcement comes as Arm beneficial properties a bigger position in enterprise infrastructure. Main cloud suppliers have launched their very own Arm processors, whereas open-source infrastructure, AI and cloud-native software program more and more helps the structure. In response to Meredith Stowell, IBM’s vice chairman for the zSystems Ecosystem, the Arm ecosystem consists of greater than 22 million builders and a rising collection of cloud-native, AI, analytics, infrastructure and enterprise software program.
IBM’s mainframes stay central to many massive organizations, notably in monetary providers. IBM says its Z and LinuxONE programs run 68% of the world’s manufacturing IT workloads, whereas 77 of the world’s 100 largest banks use the platforms.
Nonetheless, the mainframe market is restricted in contrast with the broader server market. That may make IBM Z a decrease precedence for unbiased software program distributors, even because the programs proceed to run a number of the most crucial workloads inside main corporations.
George Cozma, an analyst at TechInsights, advised The Register that the market is “small in unit phrases” however “strategically vital.” He mentioned clients hardly ever exchange mainframes as a result of “core purposes, a long time of operational observe, and knowledge gravity make migration costly and dangerous.”
Cozma mentioned the dual-architecture processor might assist shut the space between IBM Z and the software program atmosphere driving fashionable cloud and AI deployments. The know-how would let IBM retain the options which have lengthy outlined its mainframes whereas increasing the software program out there to clients.
IBM Z programs already run Linux workloads beside z/OS purposes by way of KVM and OpenShift virtualization. The brand new processor would increase that mannequin by supporting each s390x/Z and Arm64 digital machines.
IBM hasn’t introduced plans to help working programs past these mentioned at Scorching Chips. However by including Arm execution on to the processor, the corporate is attempting to make its subsequent mainframe technology extra helpful for organizations that want each legacy-scale transaction processing and newer Linux and AI workloads.
