Editing NetBurst (section)

== Revisions ==
{{Main|Pentium 4}}

{| class="wikitable" style="float: right; margin-left: 1.5em; margin-right: 0; margin-top: 0;"
|-
! Revision
! Processor Brand(s)
! Pipeline stages
|-
| Willamette (180&nbsp;nm)
| Celeron, Pentium 4, Xeon
| 20
|-
| Northwood (130&nbsp;nm)
| Celeron, Pentium 4, Pentium 4 HT, Pentium 4 HT Extreme Edition, Xeon
| 20
|-
| Prescott (90&nbsp;nm)
| Celeron D, Pentium 4, Pentium 4 HT,<br />Pentium 4 HT Extreme Edition, Xeon
| 31
|-
| Cedar Mill (65&nbsp;nm)
| Celeron D, Pentium 4 HT
| 31
|-
| Smithfield (90&nbsp;nm)
| Pentium D, Xeon
| 31
|-
| Presler (65&nbsp;nm)
| Pentium D, Xeon 
| 31
|}
Intel replaced the original ''Willamette'' core with a redesigned version of the NetBurst microarchitecture called ''Northwood'' in January 2002. The ''Northwood'' design combined an increased cache size, a smaller 130&nbsp;nm fabrication process, and [[Hyper-threading]] (although initially all models but the 3.06&nbsp;GHz model had this feature disabled) to produce a more modern, higher-performing version of the NetBurst microarchitecture.

In February 2004, Intel introduced '''''Prescott''''', a more radical revision of the microarchitecture. The ''Prescott'' core was produced on a 90&nbsp;nm process, and included several major design changes, including the addition of an even larger cache (from 512 KB in the ''Northwood'' to 1 MB, and 2 MB in Prescott 2M), a much deeper [[instruction pipeline]] (31 stages as compared to 20 in the ''Northwood''), a heavily improved [[branch predictor]], the introduction of the [[SSE3]] instructions, and later, the implementation of Intel Extended Memory 64 Technology (EM64T), Intel's branding for their compatible implementation of the [[x86-64]] 64-bit version of the [[x86]] microarchitecture (as with hyper-threading, all ''Prescott'' chips branded Pentium 4 HT have hardware to support this feature, but it was initially only enabled on the high-end [[Xeon]] processors, before being officially introduced in processors with the [[Pentium]] trademark). Power consumption and heat dissipation also became major issues with ''Prescott'', which quickly became the hottest-running, and most power-hungry, of Intel's single-core x86 and x86-64 processors. Power and heat concerns prevented Intel from releasing a Prescott clocked above 3.8&nbsp;GHz, along with a mobile version of the core clocked above 3.46&nbsp;GHz.

Intel also released a dual-core processor based on the NetBurst microarchitecture branded Pentium D. The first Pentium D core was codenamed ''Smithfield'', which is actually two Prescott cores in a single die, and later ''Presler'', which consists of two ''Cedar Mill'' cores on two separate dies (''Cedar Mill'' being the 65&nbsp;nm die-shrink of ''Prescott'').