Power Systems
The unified IBM server brand created in April 2008 when System i and System p, previously separate product lines, merged on the POWER6 processor generation.
Power Systems is the name IBM has used for its Power-processor-based server line since April 2008. Before that date, IBM sold System i (IBM i / OS400 focused) and System p (AIX/Linux focused) as separately branded and marketed lines on the same processor family. The unification happened on the POWER6 generation.
Related Terms
POWER6
IBM's dual-core processor generation shipped starting May 2007, notable for very high clock speeds and hardware decimal floating-point support.
System i
IBM's server product line running i5/OS (later IBM i), the direct descendant of the AS/400, sold as a separate brand from System p until the 2008 Power Systems unification.
System p
IBM's AIX/Linux-focused server product line, sold on the same underlying POWER processor family as System i but as a separate brand until the 2008 Power Systems unification.
IBM i
The current name of the operating system that ran the AS/400 as OS/400 and later i5/OS. Renamed to IBM i in April 2008, alongside the Power Systems brand unification.