GPU
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 The original Xenos, Y1 | |
| Introduced | Late 2005 |
|---|---|
| Designed By | ATi Microsoft NEC (eDRAM) |
| Codename | ATi C1 |
| Type | GPU |
| Used In | Original Xbox 360 |
| Clock Speed | 500MHz |
| Memory | 10MB eDRAM |
| Successor | XCGPU |
Xenos, codenamed C1, is the graphics processor, northbridge, and memory controller used in the Xbox 360. It also has an NEC designed eDRAM which contains additional logic.
The processor was developed by Microsoft and ATi, and the first version was codenamed Y1, which stands for Year 1.
Specifications
GPU
- 500Mhz clock speed
- 48 floating-point vector processors divided into 3 dynamically scheduled SIMD groups (16 each)
- Unified shader architecture
- 16 texture addressing units
- 16 texture filtering units
- 8 pixel rendering pipelines
- Direct access to CPU L2 cache
eDRAM
- 10MB 256GB/s eDRAM
- Contains logic for:
- 4-sample anti-aliasing
- Alpha compositing
- Color
- Z/stencil buffering