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
- ES3 (C00) 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.
- Part Number: X02056 (-010, -011, -012)
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 Edifis 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
Prototypes
Y1 Engineering Samples by stepping. Text on many of these chips is very faint and hard to capture. Most use the older Xbox logo.
A11N1
The first version of the Y1 GPU. Supposedly, the eDRAM is broken and does not work. Little else is known.
- Part Number: X02056-002
A11N2
Fixes the eDRAM issue. Two substrate colors have been seen. Little else is known.
- Part Number: X02056-004
A21
First major update. Sometimes referred to as A21N1.
- Part Number: X02056-006
A21N2
Minor update from A21.
- Part Number: X02056-008
A debug substrate version has also been seen, marked as "GPU DBG".
- Part Number: X02074-007
A31
Second major update. Also shown is a slow cornering chip with the final Xbox 360 logo.
- Part Number: X02056-009
A32
Minor update from A31. Engineering sample for the final production chip.
- Part Number: X02056-010 (same as final)
