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

• 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 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.

A11N1

First version. Supposedly, the ES1 (A00) eDRAM is broken and does not work.

• Part Number: X02056-002

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.

• 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)