Venus

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Venus
X809141-001.jpg
Part NumberX809141
IntroducedEarly 2006
Designed ByATi
Microsoft
NEC (eDRAM)
TypeGPU
Clock Speed500MHz
Memory10MB eDRAM
Process90nm (GPU die)
80nm (eDRAM die)
PackageFlip-chip BGA1017
SuccessorRhea

Venus is an engineering sample GPU used to checkout the first version of the 80nm Styx eDRAM. The GPU die is the same 90nm die as Y1.

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
  • A32 stepping
  • 90nm process

eDRAM

  • 10MB 256GB/s DRAM
  • Contains logic for:
    • 4-sample anti-aliasing
    • Alpha compositing
    • Color
    • Z/stencil buffering
  • FS11 stepping
  • 80nm process

Details

Venus from another angle

Based on the manufacturing date, it is speculated that this chip was designed in order to test Styx-80 before the Y2 or Y3 GPU dies were available. The GPU die is marked with "GPU Y3/Venus ES", indicating that it is part of the Y3 program. Little else is known about Venus.