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This article is about the GPU used in Xbox 360 game console, codenamed "Xenos". For other uses, see Xenos (disambiguation).
Xbox 360 GPU; note the smaller eDRAM
die to the left of the main Xenos die
The Xenos GPU is a custom chip designed by ATI, used in the Xbox 360 video game console. Developed under the codename "C1", sometimes "R500" [1]. The chip contains two separate silicon dies: the parent GPU and the daughter eDRAM.
[edit] Specifications
- 337 million transistors in total
- 500 MHz 10 MiB daughter embedded DRAM (eDRAM) framebuffer on 90 nm process
- 500 MHz parent GPU on 90 nm TSMC process of total 232 million transistors
- 48-way parallel floating-point dynamically-scheduled shader pipelines[3]
- Unified shader architecture (each pipeline is capable of running either pixel or vertex shaders)
- 2 shader ALU operations per pipeline per cycle (1 vector4 and 1 scalar, co-issued)
- 10 FLOPS per pipeline per cycle
- 48 billion shader operations per second theoretical maximum (2 ALU x 48 shader pipelines x 500 MHz)[3]
- 240 GFLOPS (10 FLOPS x 48 shader pipelines x 500 MHz)[4]
- MEMEXPORT shader function
- Support for a superset of DirectX 9.0c/API DirectX XBOX 360, and Shader Model 3.0/3.5
- 16 filtered and 16 unfiltered texture samples per clock
- Maximum vertex count: 1.6 billion vertices per second
- Maximum polygon count: 500 million triangles per second[3]
- Maximum texel fillrate: 8 gigatexel per second fillrate (16 textures x 500 MHz)
- Maximum pixel fillrate: 16 gigasamples per second fillrate using 4X multisample anti aliasing (MSAA), or 32 gigasamples using Z-only operation; 4 gigapixels per second without MSAA (8 ROPs x 500 MHz)[1]
- Maximum Dot product operations: 24 billion per second
- Cooling: Both the GPU and CPU of the console have heatsinks. The CPU's heatsink uses heatpipe technology, to efficiently conduct heat from the CPU to the fins of the heatsink. The heatsinks are actively cooled by a pair of 60 mm exhaust fans that push the air out of the case by negative case pressures.
[edit] References
[edit] See also
