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=== X810478 ===
=== X810478 ===
A revised version of GPU Zeus using the C23 design. The specifics of what changed between the two designs is not known. This chip is a drop-in replacement for the earlier [[#X817793|X817793]] version of Zeus.
A revised version of GPU Zeus using the C23 design. The specifics of what changed between the two designs is not known. This chip is a drop-in replacement for the earlier [[#X817793|X817793]] version of Zeus. These chips are known to be reliable.


* Part Number: X810478
* Part Number: X810478

Revision as of 22:51, 2 January 2023

Zeus
X817793-001.jpg
Original Zeus (X817793)
X810478-002.jpg
Revised Zeus (X810478)
Part NumberX817793
X810478
IntroducedLate 2008
Designed ByATi
Microsoft
NEC (eDRAM)
CodenameC22 (X817793)
C23 (X810478)
TypeGPU
Used InJasper
Clock Speed500MHz
Memory10MB eDRAM
Process65nm (GPU die)
80nm (eDRAM die)
PackageFlip-chip BGA1017
PredecessorRhea
SuccessorKronos

Zeus, also known as Y3 or Gunga, is a 65nm GPU used in the Xbox 360. It is the successor to Rhea. Initial variants used the C22 design, later variants used the C23 design. The 65nm process shrink required a partial redesign of the chip. The eDRAM was not shrunk and remains on a 80nm process.

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
  • 65nm process

eDRAM

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

Details

X817793

The initial version of GPU Zeus using the C22 design. Ballout is compatible with the previous 80nm GPUs, however minor changes to the motherboard must be made. These chips are known to be reliable.

  • Part Number: X817793
  • Foundry: Taiwan Foundry

X810478

A revised version of GPU Zeus using the C23 design. The specifics of what changed between the two designs is not known. This chip is a drop-in replacement for the earlier X817793 version of Zeus. These chips are known to be reliable.

  • Part Number: X810478
  • Foundry: Taiwan Foundry