One of the helpful resources Sirius maintains is a concise Power Systems Reference chart that includes detailed configuration information about IBM Power Systems servers. These charts originally contained details about the IBM AS/400 server line. Over the years, the name has changed in response to changes in the IBM nomenclature (AS/400 to iSeries to System i to Power Systems with IBM i) and consolidation of the brands (System i and System p to Power Systems).
Sirius has just updated this document, which has historically been one of the most popular assets on our site. You can download the latest version and/or get previous versions to help you plan for migrations or upgrades from one of the older systems.