Intel Pentium 4 Willamette core

Pentium 4 family · All CPU core names

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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 familiesDesktop Pentium 4Celeron
Manufacturing technology0.18 micron
Frequency (MHz)1300 - 20001500 - 2000
Fastest processorRN80528PC041G0K - 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 cache256 KB128 KB
Socket typeSocket 423
Socket 478
Socket 478
Note Willamette core with 128 KB level 2 cache is often called Willamette-128

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