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.

Microprocessor families	Desktop Pentium 4	Celeron
Manufacturing technology	0.18 micron
Frequency (MHz)	1300 - 2000	1500 - 2000
Fastest processor	RN80528PC041G0K - 2.0 GHz, socket 423 RK80531PC041G0K - 2.0 GHz, socket 478	RK80531RC041128 (BX80531P200G128) - 2.0 GHz
Front-side bus frequency (MHz)	400 (100 MHz QDR)
L2 cache	256 KB	128 KB
Socket type	Socket 423 Socket 478	Socket 478
Note		Willamette core with 128 KB level 2 cache is often called Willamette-128