Waternoose

Waternoose

DD1.0
File:X02046-008.jpg DD2.1 (X02046)
DD3.0 (X806416)
Part Number	X02046 X806416
Introduced	Late 2005
Designed By	IBM Microsoft
Type	XCPU
Used In	Xenon Zephyr
Clock Speed	2.8-3.2GHz
Cache	L1: 32KB/32KB L2: 1MB
Instruction Set	PowerPC RISC
Cores	3
Threads	6
Process	90nm
TDP	85W (DD1.0/DD2.0) 75W (DD2.1/DD3.0)
Package	Flip-chip BGA899
Successor	Loki

The Waternoose series are the original production model of the XCPU used in the Xbox 360. They have 75-85W TDPs and are manufactured on the 90nm process.

Specifications

• 3 two-way SMD-capable RISC cores clocked at 3.2GHz
• SIMD: Two VMX128 units
• 32KB L1 data cache
• 32KB L1 instruction cache
• 1MB L2 cache at 1.6 GHz with a 256-bit bus
• 21.6GB/s FSB
• 768 bits of IBM eFUSE One-Time-Program memory for fusesets
• One-Time-Programmable ROM and 64KB SRAM for the 1BL and Config Ring
• Big-endian architecture
• 90nm process
• TDP:
  • 85W (DD1.0/DD2.0)
  • 75W (DD2.1/DD3.0)

Details

DD1.0

DD1.0, is the engineering sample of the XCPU, labelled XCPU-ES. It runs at 2.8GHz as opposed to the final speed of 3.2GHz. The ROM does not contain a 1BL, and thus these CPUs can only boot with a Titan board, which injects the 1BL. It still has the original Xbox logo as it was created before the Xbox 360 name was chosen.

• Part Number: X02046-001
• Foundry: Canada Foundry

DD2.0

DD2.0, is the production version of the XCPU running at 3.2GHz. It also contains a programmed ROM containing the 1BL. Versions with part number X02046-002 used in certain pre-final consoles were still labelled "XCPU-ES" and still had the original Xbox logo.

• Part Numbers:
  • X02046 (except -001)
• Foundries:
  • Canada Foundry

DD2.1

DD2.1 is a revision of DD2.0, with the notable change of reducing the TDP to 75W from the initial 85W. The part number remains the same, however the suffix may be different.

DD3.0

DD3.0, is a revision of DD2.1. It is not known what the difference between these two chips are.

• Part Numbers:
  • X806416
• Foundries:
  • Canada Foundry