Waternoose

Waternoose

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

The Waternoose series are the original production model of the XCPU and are used on Xenon and Zephyr motherboards. They have 75-85W TDPs and are manufactured on a 90nm process.

They are named after the fictional character Henry J. Waternoose III.

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
• A00 stepping (DD1, DD3)
• B00 stepping (DD2)
• B01 stepping (DD2.1)
• 90nm process
• TDP: 75W/85W

Details

DD1

DD1 is the engineering sample of the XCPU with A00 stepping, labelled XCPU-ES. It runs at 2.8GHz as opposed to the final speed of 3.2GHz. Due to mistakes in the POR sequence, these CPUs can only boot with a Titan board functioning as a service processor to bring up the CPU. It still has the original Xbox logo as it was created before the Xbox 360 name was chosen.

• Part Number: X02046 (-001)

DD2

DD2 is the initial production version of the XCPU with B00 stepping, running at 3.2GHz. Very early versions with part number X02046-002 used in certain pre-final consoles were still labelled "XCPU-ES" and ran at 2.8GHz.

• Part Number: X02046 (-002 and -003)

DD2.1

DD2.1 is a minor revision of DD2 with B01 stepping, that improved yield and binned chips for 75W and 85W. This allowed most motherboards to have 75W CPUs.

• Part Number: X02046 (-004 and up)

DD3

DD3 is a revision of DD2 that fixes minor design issues. With the new part number, the stepping reset to A00. All chips are 75W. It also adds little-endian support which was unused due to all software features requiring full compatibility with the earlier DD2 chip.

• Part Number: X806416