Kronos

Kronos

Part Number	X820894
Introduced	Late 2009
Designed By	ATi Microsoft NEC (eDRAM)
Codename	Gunga
Type	GPU
Used In	Jasper (Only in July 2009) Tonasket
Clock Speed	500MHz
Memory	10MB eDRAM
Process	65nm (Both dies)
Package	Flip-chip BGA1017
Predecessor	Zeus
Successor	Valhalla

Kronos is a 65nm GPU used in the Xbox 360. It is the successor to Zeus and has the C23 design. No significant changes were made to the GPU. The eDRAM process was shrunk to 65nm. Kronos has proven to be the most reliable GPU.

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
• 65nm process

Details

• Part Number: X820894
• Foundries:
  • Korea Foundry
  • Taiwan Foundry