Concept

POWER5

Summary
The POWER5 is a microprocessor developed and fabricated by IBM. It is an improved version of the POWER4. The principal improvements are support for simultaneous multithreading (SMT) and an on-die memory controller. The POWER5 is a dual-core microprocessor, with each core supporting one physical thread and two logical threads, for a total of two physical threads and four logical threads. History Technical details of the microprocessor were first presented at the 2003 Hot Chips conference. A more complete description was given at Microprocessor Forum 2003 on 14 October 2003. The POWER5 was not sold openly and was used exclusively by IBM and their partners. Systems using the microprocessor were introduced in 2004. The POWER5 competed in the high-end enterprise server market, mostly against the Intel Itanium 2 and to a lesser extent, the Sun Microsystems UltraSPARC IV and the Fujitsu SPARC64 V. It was superseded in 2005 by an improved iteration, the POWER5+. Descri
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