Zeus

Zeus

Original Zeus (X817793)
Revised Zeus (X810478)
Part Number	X817793 X810478
Introduced	Late 2008
Designed By	ATi Microsoft NEC (eDRAM)
Codename	C22 (X817793) C23 (X810478)
Type	GPU
Used In	Jasper
Clock Speed	500MHz
Memory	10MB eDRAM
Process	65nm (GPU die) 80nm (eDRAM die)
Package	Flip-chip BGA1017
Predecessor	Rhea
Successor	Kronos

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. Zeus was the first version of Xenos where all variants are known to be reliable.

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.

• 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.

• Part Number: X810478
• Foundry: Taiwan Foundry