The Xenos GPU is a custom graphics processing unit (GPU) designed by ATI, used in the Xbox 360 video game console. Developed under the codename "C1," it is in many ways the precursor to the R600 desktop PC graphics card series. The chip contains two separate silicon dies: the parent GPU and the daughter eDRAM.
On chip, the shaders are organized in three SIMD engines with 16 processors per unit, for a total of 48 shaders. Each of these shaders is comprised of two ALUs that can execute a single operation per cycle, so that each shader unit can execute two floating-point operations per cycle.
