Rhea

Rhea

Original Rhea (X810480)
Revised Rhea (X816970)
Revised Rhea (X816971)
Part Number	X810480 X816970 X816971
Introduced	Mid 2007
Designed By	ATi Microsoft NEC (eDRAM)
Codename	C2
Type	GPU
Used In	Zephyr_C Falcon
Clock Speed	500MHz
Memory	10MB eDRAM
Process	80nm (Both dies)
Package	Flip-chip BGA1017
Predecessor	Y2
Successor	Zeus

See also: Elpis (GPU)

Rhea, also known as B14L, is an 80nm GPU used in the Xbox 360. It is the successor to Y2. No significant changes were made to the GPU. The eDRAM process was shrunk to 80nm.

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
• 80nm process

Details

X810480

Fixed X810480 with higher Tg underfill

The initial version of GPU Rhea. 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. Production of this chip paused sometime between weeks 12 through 20 of 2008, and the X816970 and X816971 chips were produced instead to test fixed chips with different underfill materials. This lasted until Mid-2009, when X810480 chips with higher Tg underfill began being produced. These revised chips are known to be reliable.

• Part Number: X810480
• Foundry: Taiwan Foundry

X816970

A revised version of GPU Rhea with higher Tg underfill material that appears dark. Some versions are marked with "Htg85". These chips are known to be reliable.

• Part Number: X816970
• Foundries:
  • Korea Foundry
  • Taiwan Foundry

X816971

X816971 marked with Htg130

A second revised version of GPU Rhea with higher Tg underfill material that appears milky white. Some versions are marked with "Htg130". These chips are known to be reliable.

• Part Number: X816971
• Foundry: Korea Foundry