IBM Power Hardware Center
IBM Power Systems are the hardware platform that runs IBM i workloads today. This section covers Power9, Power10, and Power11 hardware, model history, and how to evaluate your current environment.
IBM Power Systems replaced the AS400 and iSeries hardware lines. This section covers the hardware side of the IBM midrange stack: model numbers, CPW ratings, sizing basics, and how to navigate the IBM Power product family.
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AS400 Model History
IBM launched the AS/400 in 1988 as a single integrated hardware and software system. The AS400 model line ran for roughly a decade, spanning the original CISC-based systems and the mid-1990s transition to RISC hardware, before the platform was rebranded iSeries in 2000.
IBM Power Sizing Basics
Sizing an IBM Power system means matching processor CPW, memory, and storage to a workload, plus the correct IBM i software tier, with enough headroom for growth. This guide covers the basic concepts IT teams need before evaluating an AS400 or older Power hardware upgrade.
IBM Power Systems Overview
IBM Power Systems is the hardware brand IBM introduced in 2008 to unify its Power-processor-based servers, replacing the earlier System i and System p lines. It is the hardware platform that runs IBM i, AIX, and Linux workloads today, including the modern successors to AS400 environments.
iSeries Model History
IBM renamed the AS400 platform iSeries in October 2000, as part of its e-business branding strategy. The iSeries model line ran through 2006, including a 2004 refresh onto POWER5 processors under the iSeries i5 name, before IBM renamed the platform again to System i.
System i Model History
IBM renamed the iSeries platform System i in 2006, aligning it with the System p, System x, and System z brand family. System i was the last name the AS400 lineage carried before IBM split the OS and hardware brands into IBM i and IBM Power Systems in 2008.