Rhea

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Rhea
X810480-003.jpg
Original Rhea (X810480)
X816970-001.jpg
Revised Rhea (X816970)
X816971-002.jpg
Revised Rhea (X816971)
Part NumberX810480
X816970
X816971
IntroducedMid 2007
Designed ByATi
Microsoft
NEC (eDRAM)
CodenameC2
TypeGPU
Used InZephyr_C
Falcon
Clock Speed500MHz
Memory10MB eDRAM
Process80nm (Both dies)
PackageFlip-chip BGA1017
PredecessorY2
SuccessorZeus

Rhea is an 80nm GPU used in the Xbox 360. It is the successor to Y2 and uses the B14L core. 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 DRAM
  • Contains logic for:
    • 4-sample anti-aliasing
    • Alpha compositing
    • Color
    • Z/stencil buffering
  • 80nm process

Details

X810480

Fixed X810480 with higher Tg underfill from 2008
Fixed X810480 with higher Tg underfill from 2010

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 Late-2008, 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