Y1 (GPU)

Y1

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

Korean X02056 from 2008

Uncommon -012 model X02056 from 2005

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 (A11)
  • X02056-002 (A11N1)

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)