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, codename C1, 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 (Xenos C1)
- 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 (Edifis)
- 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 Xenos C1 GPU and 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. 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
Engineering Samples by stepping. Text on many of these chips is very faint and hard to capture. Most use the older Xbox logo.
A11/A11N1
First version. Supposedly, the ES1 (A00) eDRAM is broken and does not work.
- Part Numbers:
- X02056-001 (A21)
- X02056-002 (A21N1)
A11N2
Fixes the eDRAM issue with ES2 (B00). Two substrate colors have been seen.
- Part Number: X02056-004
A debug substrate version also exists, marked as "GPU DBG". It is believed to have more debug traces.
- Part Number: X02074-003
A21/A21N1
Major update. Changed to ES3 (C00) eDRAM. Marked either A21 or A21N1, same silicon. A21N1 seen with a blue die.
- Part Numbers:
- X02056-006 (A21)
- X02056-007 (A21N1)
A21N2
Very minor update.
- Part Number: X02056-008
A debug substrate version also exists, marked as "GPU DBG". It is believed to have more debug traces.
- Part Number: X02074-007
A31
Major update. Also shown is a slow cornering chip with the final Xbox 360 logo.
- Part Number: X02056-009
A32
Minor update. Engineering sample for the final production chip.
- Part Number: X02056-010 (same as final)
