Waternoose

Waternoose

DD1.0
File:X02046-008.jpg DD2.1 (X02046)
DD2.1 (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)
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)

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. There are 2 versions of the chip with different part numbers. It is not known what the difference between these two chips are. 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)
  • X806416
• 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.