Zeus

Zeus

Original Zeus (X817793)
Revised Zeus (X810478)
Part Number	X817793 X810478
Introduced	Late 2008
Designed By	Microsoft
Codename	Gunga
Type	GPU
Used In	Jasper
Clock Speed	500MHz
Memory	10MB eDRAM
Process	65nm (GPU die) 90nm (eDRAM die)
Package	Flip-chip BGA1017
Predecessor	Rhea Elpis
Successor	Kronos

Zeus, codenames Gunga and Y3, is a 65nm GPU and is used on the Jasper motherboard. It is the successor to Rhea. The 65nm process shrink required a partial redesign of the chip. The eDRAM was unchanged. Zeus was the first version of the GPU where all variants are known to be reliable. The 65nm redesign was done by Microsoft themselves, not ATi.

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
• C22 stepping (X817793)
• C23 stepping (X810478)
• 65nm process

eDRAM (Styx-90)

• 10MB 256GB/s eDRAM
• Contains logic for:
  • 4-sample anti-aliasing
  • Alpha compositing
  • Color
  • Z/stencil buffering
• FS21 stepping
• 90nm process

Details

All variants of Zeus use the Styx eDRAM.

X817793

The initial version of GPU Zeus with C22 stepping. The ballout is compatible with the previous 90nm GPUs, however minor changes to the motherboard must be made.

• Part Number: X817793

X810478

A revised version of GPU Zeus with C23 stepping. The specifics of what changed between the two cores is not known. This chip is a drop-in replacement for the earlier version of Zeus.

• Part Number: X810478

Prototypes

Engineering Samples by stepping.

C11

First version.

• Part Number: X812419-001

C12

Minor update. Marked as C12P.

• Part Number: X813271-002

C21

Major update.

• Part Numbers:
  • X815990-001
  • X815992-001

C22

Minor update. Engineering sample for the final C22 production chip.

• Part Numbers:
  • X815988-002
  • X815989-002
  • X817124-001
  • X818063-001