IBM Power & AS400 Glossary

Definitions of IBM Power Systems, AS400, iSeries, and IBM i terminology for IT professionals and decision-makers evaluating IBM Power upgrades.

A

AS400 IBM's Application System/400, a midrange business computing platform introduced in 1988, now evolved into IBM i on IBM Power Systems.

I

IBM i IBM's operating system for Power Systems, evolved from the AS400 OS/400. IBM i 7.5 is the current release, actively developed and supported by IBM.
iSeries The name IBM used for the AS400 platform from 2000 to 2006, when it ran on POWER4 and POWER5 processors. Now superseded by the IBM i on Power branding.
IBM Power Systems IBM's line of RISC-based enterprise servers running IBM i, AIX, and Linux workloads. The current generation is IBM Power11, introduced in 2024.
IBM Power11 IBM's current generation Power Systems hardware, introduced in 2024. Power11 delivers improved per-core performance, AI acceleration, and energy efficiency over Power10.
IBM Power10 IBM's previous generation Power Systems hardware, introduced in 2021. Power10 introduced the Matrix Math Accelerator (MMA) for AI workloads and enhanced memory bandwidth.