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IBM Discloses Xbox 360 CPU Design


By hagrin - Posted on 05 August 2006

IBM has released information concerning the design of the Xbox 360 CPU. From their white paper:

The Xbox 360 system has a single chip (with 165 million transistors) for its CPU. This chip is in fact a three-way symmetric multiprocessor design. The three PowerPC cores are identical, except that they are physically reflected through the X and Y axis. Each of the CPU cores is a specialized PowerPC chip with a VMX128 extension related to (and partially compatible with) the VMX instructions in the G4 and G5 CPUs. The three CPU cores share a 1MB Level2 cache. Each processor has 32KB each of data and instruction Level1 cache. The chip's front-side bus/physical interface has a 21.6GB/second bandwidth, and runs at 5.4GHz. The high frequency clocks are generated on-chip by four phase-locked loops: two for the core clocks, two for the PHY clock.

A mouthful I know, but some great technical details for all those looking to get underneath the hood of the Xbox 360.