Editing Celeron (section)

==== Prescott-256 {{Anchor|Celeron D}} ====
[[File:Intel Celeron D 340 (Prescott) (JPG).jpg|thumb|Prescott Celeron D 340 die shot ]]
Prescott-256 '''Celeron D''' processors, initially launched June 25, 2004,<ref>{{cite news|last=Shilov|first=Anton|title=Intel Officially Launched Celeron D Processors.|url=http://www.xbitlabs.com/news/cpu/display/20040625022821.html|publisher=X-bit labs|date=June 25, 2004|access-date=July 31, 2007|url-status=dead|archive-url=https://web.archive.org/web/20070930014514/http://www.xbitlabs.com/news/cpu/display/20040625022821.html|archive-date=September 30, 2007|df=dmy-all}}</ref> featuring double the L1 cache (16&nbsp;KB) and L2 cache (256&nbsp;KB) as compared to the previous Willamette and Northwood desktop Celerons, by virtue of being based on the ''[[Pentium 4#Prescott|Prescott]]'' Pentium 4 core.<ref>{{cite news|last=Wilson|first=Derek|title=Intel Celeron D: New, Improved & Exceeds Expectations|url=http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2093| publisher=[[AnandTech]]|date=June 24, 2004|access-date=July 31, 2007}}</ref>

It also features a 533&nbsp;MT/s bus and [[SSE3]], and a 3xx model number (compared to 5xx for Pentium 4s and 7xx for Pentium Ms). The Prescott-256 Celeron D was manufactured for [[Socket 478]] and [[LGA 775]], with 3x0 and 3x5 designations from 310 through to 355 at clock speeds of 2.13&nbsp;GHz to 3.33&nbsp;GHz.

The Intel Celeron D processor works with the Intel 845 and 865 chipset families. The ''D'' suffix actually has no official designation and does not indicate that these models are dual-core. It is used simply to distinguish this line of Celeron from the previous, lower performing Northwood and Willamette series, and also from the mobile series, the Celeron M (which also uses 3xx model numbers).<ref>{{cite news|last=Aubrey|first=John|title=Celeron D: the Little Processor that Could|url=http://www.devhardware.com/c/a/Computer-Processors/Celeron-D-the-Little-Processor-that-Could|publisher=Dev Hardware| date=April 18, 2005| access-date=September 23, 2006}}</ref> Unlike the [[Pentium D]], the Celeron D is ''not'' a dual core processor.

The Celeron D was a major performance improvement over previous NetBurst-based Celerons. A test using a variety of applications, run by Derek Wilson at Anandtech.com, showed that the new Celeron D architecture alone offered up performance improvements on average of >10% over a Northwood Celeron when both CPUs were run at the same bus and clock rate.<ref>{{cite news|last=Wilson|first=Derek|title=Intel Celeron D: New, Improved & Exceeds Expectations|url=http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2093&p=5|publisher=[[AnandTech]]| date=June 24, 2004|access-date=July 31, 2007}}</ref> This CPU also had the addition of SSE3 instructions and the higher FSB which only contributed to this already impressive gain.

Despite its many improvements, the ''Prescott'' core of the Celeron D had at least one major drawback{{snd}} heat. Unlike the fairly cool-running Northwood Celeron, the Prescott-256 had a class-rated [[thermal design power|TDP]] of 73&nbsp;W, which prompted Intel to include a more intricate copper core/aluminum finned cooler to help handle the additional heat.<ref>{{cite news | last=Gavrichenkov | first=Ilya | title=Intel Celeron D CPU: Budget Processors from Intel Acquire Prescott Core | url=http://www.xbitlabs.com/articles/cpu/display/celeron-d_6.html | publisher=X-bit labs | date=June 25, 2004 | access-date=July 31, 2007 | url-status=dead | archive-url=https://web.archive.org/web/20070807042345/http://www.xbitlabs.com/articles/cpu/display/celeron-d_6.html | archive-date=August 7, 2007 | df=dmy-all }}</ref>

In mid-2005, Intel refreshed the Celeron D with [[Intel 64]] and [[XD Bit]] (eXecute Disable) enabled. Model numbers increase by 1 over the previous generation (e.g., 330 became 331). This only applied to [[LGA 775]] Celeron Ds. There are no [[Socket 478]] CPUs with XD Bit capabilities.

In Intel's "Family/Model/Stepping" scheme, Prescott Celeron Ds and Pentium 4s are family 15, model 3 (up to stepping E0) or 4 (stepping E0 onwards), and their Intel product code is 80546 or 80547, depending on socket type.