Rhea

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Rhea
X810480-003.jpg
Original Rhea (X810480)
X816970-002.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, also known as Y2.5, is an 80nm GPU and is used on the Zephyr_C and Falcon motherboards. 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
  • B14L stepping
  • 80nm process

eDRAM

  • 10MB 256GB/s DRAM
  • Contains logic for:
    • 4-sample anti-aliasing
    • Alpha compositing
    • Color
    • Z/stencil buffering
  • FS21 stepping
  • 80nm process

Details

All variants of Rhea use the Styx eDRAM.

X810480

Fixed X810480 with higher Tg underfill from 2010

The initial version of 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. In Late-2009, X810480 chips with higher Tg underfill began being produced. These revised chips are known to be reliable.

  • Part Number: X810480

X816970

A revised version of 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

X816971

X816971 marked with Htg130

A second revised version of 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