Y1 (GPU)
 Original Y1 (X02056) | |
 Revised Y1 (X817791) | |
| Part Number | X02056 X817791 |
|---|---|
| Introduced | Late 2005 |
| Designed By | ATi Microsoft NEC (eDRAM) |
| Codename | C1 |
| Type | GPU |
| Used In | Xenon Zephyr_A |
| Clock Speed | 500MHz |
| Memory | 10MB eDRAM |
| Process | 90nm (Both dies) |
| Package | Flip-chip BGA1017 |
| Successor | Y2 Elpis |
Y1 is the launch model GPU and is used on the Xenon and Zephyr_A motherboards. Both dies are manufactured 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
- A32 stepping
- 90nm process
eDRAM
- 10MB 256GB/s eDRAM
- Contains logic for:
- 4-sample anti-aliasing
- Alpha compositing
- Color
- Z/stencil buffering
- C00 or ES3 stepping
- 90nm process
Details
X02056
The initial version of the GPU Y1, used in the launch model consoles. It uses the Edifis eDRAM. 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. Starting sometime between weeks 12 through 20 of 2008, chips with higher Tg underfill began being produced. These revised chips are known to be reliable.
- Part Number: X02056
X817791
In Mid 2008, GPU Y1 received a revision and part number change. "GPU - Y1" markings were added to differentiate from other in-production chips. It uses the Styx [[eDRAM]. In addition, it uses a higher Tg underfill material and as a result, is known to be reliable. It is not known if there are any other differences.
- Part Number: X817791