Xenon (processor)

Xenon (processor)

Xenon is a CPU used in the Xbox 360 game console. The processor, internally codenamed "Waternoose", which was named after Henry J. Waternoose III in Monsters, Inc. by IBM and XCPU by Microsoft, is based on IBM PowerPC instruction set architecture, consisting of three independent processor cores on a single die. These cores are slightly modified versions of the PPE in the Cell processor used on the PlayStation 3. Each core has two symmetric hardware threads (SMT), for a total of six hardware threads available to games. Each individual core also includes 32 KiB of L1 instruction cache and 32 KiB of L1 data cache.

The processors are labelled "XCPU" on the packaging and are manufactured by Chartered (now part of GlobalFoundries). Chartered reduced the fabrication process in 2007 to 65 nm, thus reducing manufacturing costs for Microsoft.

The name "Xenon" was repurposed from the code name for the Xbox 360 in early development.