Kronos

Kronos

Part Number	X820894
Introduced	Late 2009
Designed By	Microsoft
Codename	Y3
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	Vejle

Kronos is a 65nm GPU and is used on the Tonasket motherboard and Jasper motherboards built in July 2009. No significant changes were made. The eDRAM was changed to Styx-65. Kronos has proven to be the most reliable version of the GPU.

Specifications

GPU (Gunga)

• 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
• C23 stepping
• 65nm process

eDRAM (Styx-65)

• 10MB 256GB/s eDRAM
• Contains logic for:
  • 4-sample anti-aliasing
  • Alpha compositing
  • Color
  • Z/stencil buffering
• GS21 stepping
• 65nm process

Details

Kronos uses the Styx-65 eDRAM.

• Part Number: X820894

Prototypes

Engineering Samples by stepping.

C12

First version. Kronos version of Zeus C12 ES. Marked as C12P.

• Part Number: X815158-001

C21

Major update. Kronos version of Zeus C21 ES.

• Part Number: Unknown

C22

Minor update. Kronos version of Zeus C22 ES.

• Part Number: X817816-001

C23

Minor update. Kronos version of Zeus C23 ES.