Y2 (GPU)

Y2

Part Number	X02127
Introduced	Early 2007
Designed By	ATi Microsoft NEC (eDRAM)
Codename	B13L
Type	GPU
Used In	Zephyr_B
Clock Speed	500MHz
Memory	10MB eDRAM
Process	80nm (GPU die) 90nm (eDRAM die)
Package	Flip-chip BGA1017
Predecessor	Y1
Successor	Rhea

Y2 is an 80nm GPU used in the Xbox 360. It is the successor to Y1 and has the B13L design. Minimal changes were required to move from the 90nm to the 80nm process. The eDRAM was not shrunk and remains on a 90nm 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
• 80nm process

eDRAM

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

Details

The PCIe ballout was de-swizzled (flipped) for the Zephyr_B motherboard, making this chip incompatible earlier motherboards. This chip contains a design defect in which low Tg underfill is used to support the bumps. This causes reliability issues and premature failure of the chip. No versions with higher Tg underfill were produced. Thus, no versions of this chip are known to be reliable.

• Part Number: X02127
• Foundries:
  • Korea Foundry
  • Taiwan Foundry