Editing IBM System p (section)

===Processors===

Whereas the previous RS/6000 line used a mix of early [[IBM Power microprocessors|POWER]] and [[PowerPC]] processors, when pSeries came along, this had evolved into [[RS64|RS64-III]] and [[POWER3]] across the board—POWER3 for its excellent floating-point performance and RS64 for its scalability, throughput, and integer performance.

IBM developed the [[POWER4]] processor to replace both POWER3 and the RS64 line in 2001. After that, the differences between throughput and number crunching-optimized systems no longer existed. Since then, System p machines evolved to use the [[POWER5]] but also the [[PowerPC 970]] for the low-end and blade systems.

The last System p systems used the [[POWER6]] processor, such as the POWER6-based System p 570 and the JS22 blade. In addition, during the SuperComputing 2007 (SC07) conference in Reno, IBM introduced a new POWER6-based System p 575 with 32 POWER6 cores at 4.7&nbsp;GHz and up to 256&nbsp;GB of RAM with water cooling.