Intel Pentium 4 Willamette core

Previous Generation		Related Core	Next Generation
Willamette was the first core based on NetBurst micro-architecture. The last core of the previous Intel microarchitecture, P6, was Tualatin.	Willamette » 0.18 micron » NetBurst microarchitecture Pentium 4 Celeron Williamette-128 » 128 KB L2 cache Celeron		Northwood » 0.13 micron » Up to 800 MHz FSB » 512 KB L2 cache » Hyper-Threading technology Pentium 4 Celeron Mobile Pentium 4-M Mobile Pentium 4 Mobile Celeron

The Willamette core was introduced on Nov 20, 2000. This core is based on NetBurst microarchitecture.

Identification of microprocessors with Willamette core:

• By part number: The part number contains 80528 (but not 80528K), or 80531. For example: RN80528PC033G0K
• By CPU ID: First two digits of CPU identification number are F0 or F1. Please note that Xeon processors with Foster core had that same CPUIDs as Willamette processors.

Celeron microprocessors have modified Willamette core that includes only 128 KB of level 2 cache memory. To distinguish it from Pentium 4 Willamette core with 256 KB L2 cache the Celeron core is often called Willamette-128.

	Celeron	Pentium 4
Manufacturing technology	0.18 micron
Cores	1
Frequency (MHz)	1500 - 2000	1300 - 2000
Fastest processor	Celeron 2 GHz	Pentium 4 2 GHz (Socket 478, 75.3 Watt) Pentium 4 2 GHz (Socket 423, 71.8 Watt)
Bus frequency	400 MHz
L2 cache size	128 KB	256 KB
Thermal Design Power (Watt)	63.5 - 66.1	48.9 - 75.3
Package	478-pin FC-PGA	423-pin PGA 478-pin FC-PGA
Socket	Socket 478	Socket 423 Socket 478