XCPU
| File:X02046-008.jpg The original XCPU, Waternoose | |
| Introduced | 2005 |
|---|---|
| Designed By | IBM Microsoft |
| Codename | Xenon |
| Type | CPU |
| Used In | Original Xbox 360 |
| Clock Speed | 3.2GHz |
| Cache | L1: 32KB/32KB L2: 1MB |
| Instruction Set | PowerPC RISC |
| Cores | 3 |
| Threads | 6 |
| Predecessor | Shiva |
| Successor | XCGPU |
The Microsoft XCPU, codenamed Xenon, is the central processor used in the Xbox 360 game console. It is designed to be used with the ATi Xenos graphics chip, which also functions as the northbridge and memory controller.
The processor was developed by Microsoft and IBM, and the first version was codenamed Waternoose after the fictional character Henry J. Waternoose III.
Specifications
- 3 two-way SMD-capable RISC cores clocked at 3.2GHz
- SIMD: Two VMX128 units
- 32KB L1 data cache
- 32KB L1 instruction cache
- 1MB L2 cache at 1.6 GHz with a 256-bit bus
- 21.6GB/s FSB
- 768 bits of IBM eFUSE One-Time-Program memory for fusesets
- One-Time-Programmable ROM and 64KB SRAM for the 1BL and Config Ring
- Big-endian architecture
Versions
There are multiple versions of the XCPU, used on different motherboard types
Waternoose (90nm)
The initial version of the XCPU, codename Waternoose, entered production in 2005 and is used on the Xenon and Zephyr motherboards. It is notable for being quite power hungry.
Loki (65nm)
In 2007, the XCPU was shrunk and slightly redesigned for the 65nm process. Codename Loki, it is used on the Falcon and Jasper motherboards. It is notable for having significantly lower power and thermal requirements.
XCGPU
In 2010, the XCPU was shrunk to the 45nm process and combined with the Xenos graphics chip to create a system-on-a-chip, called the XCGPU.