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The New Celerons: Not Like the Old Celerons

Dec 1, 2002

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The New Celerons: Not Like the Old Celerons

Before you buy a Celeron-based system, find out exactly which Celeron you are considering.

The name Celeron is the general name that Intel has used for its economy line of processors going all the way back to the Pentium II. In short, a Celeron is a Pentium II, Pentium III, or Pentium 4 processor with some features reduced or removed. Celerons are basically designed as less expensive, stripped down, economy versions of Intel's main processors. While the specific details have varied over the years, Celerons have normally differed from Intels Pentium II, Pentium III or current Pentium 4 processors in the following ways:

Lower CPU clock speeds

Lower CPU bus speeds

Reduced size L2 cache

While these differences have made Celeron processors less powerful than the particular Pentium II/III/4 they are based on, they also make Celeron processors and Celeron-based systems less expensive. If youre looking for a low-cost system thats "Intel inside", a Celeron-based system is one way to get there.

History of the Celeron

The original Celerons were economy versions of the Intel Pentium II processor. Intel figured that by taking a Pentium II and deleting the separate L2 cache chips that were mounted inside the processor cartridge (and also deleting the cosmetic cover), they could create a "new" processor that was basically just a slower version of the Pentium II. As such the first 266MHz and 300MHz Celeron models didnt include any level 2 cache. Unfortunately this proved to have far too great a crippling effect on performance, so starting with the 300A versions, the Celeron received 128KB of on-die full-speed L2 cache, which was actually faster and more advanced than the 512KB of half-speed cache used in the Pentium II it was based on! In fact the Celeron was the first PC processor to receive on-die L2 cache. It wasn't until the Coppermine version of the Pentium III appeared that on-die L2 cache migrated to Intel's main processors.

Needless to say, this caused a lot of confusion in the marketplace about the Celeron. Considering that the Celeron started out as a "crippled" Pentium II, and then was revised so as to actually be superior in some ways to the Pentium II on which it was based (all while selling for less) many didn't know just where the Celeron stood in terms of performance. Fortunately the crippling lack of L2 cache existed only in the earliest Celeron versions, all of those at speeds greater than 300MHz have on-die full-speed L2 cache.

The earliest Celerons from 266MHz up through 400MHz were produced in a SEPP (single edge processor package) design which physically looked like a circuit board and which was designed to fit into Slot 1. This is the same slot the Pentium II used, meaning the Celeron SEPP would plug into any Pentium II Slot-1 motherboard.As the Celeron continued to develop, the form factor was changed to correspond with changes in the Pentium II, III, and 4-class processors from which it was adapted. Starting with the 300A processor (300MHz Celeron with 128KB of on-die Level 2 cache), Celerons were produced in a PPGA (plastic pin grid array) package using the Socket 370 interface. This socket, with differences in voltage, was later used by most versions of the Pentium III. Celerons using Socket 370 range in speed from 300MHz all the way up to 1.4GHz. Along the way the packaging changed from PPGA to FC-PGA (flip-chip pin grid array) and FC-PGA2. The latter added a protective metal heat spreader on top of the fragile die.

The latest Celerons are based on Pentium 4 processors. They are produced in an FC-PGA2 package that fits into the same Socket 478 that recent Pentium 4 processors use; the Celeron was never produced in the short-lived Socket 423 form factor used by the original Pentium 4 processors.

As this brief history shows, the name "Celeron" has never meant anything more specific than a reduced performance version of Intel's current mainstream processor. Before you can decide if a particular Celeron processor is a suitable choice, you need to know what its features are, and especially what processor it is based upon. There are a total of 7 discrete variations of the Celeron processor, which are detailed in the following table:

Celeron Version	Celeron	Celeron A	Celeron A-PGA	Celeron III	Celeron IIIA	Celeron 4	Celeron 4A
Based on	Pentium II Deschutes	Pentium II Deschutes	Pentium II Deschutes	Pentium III Coppermine	Pentium III Tualatin	Pentium 4 Willamette	Pentium 4 Northwood
Codename	Covington	Mendocino	Mendocino	Coppermine-128	Tualatin-256	Willamette-128	Northwood-256
Process (micron)	0.25	0.25	0.25	0.18	0.13	0.18	0.13
L2 Cache (KB)	0	128	128	128	256	128	256
Multi-Media Support	MMX	MMX	MMX	SSE	SSE	SSE2	SSE2
Physical Interface	Slot-1	Slot-1	Socket 370	Socket 370	Socket 370	Socket 478	Socket 478
Package	SEPP	SEPP	PPGA	FC-PGA	FC-PGA2	FC-PGA2	FC-PGA2
CPU Bus Speed	66 MHz	66 MHz	66 MHz	66/100 MHz*	100 MHz	400 MHz	400 MHz
Min. Speed	266 MHz	300A MHz	300A MHz	533A MHz	900 MHz	1.7 GHz	2.0A GHz
Max. Speed	300 MHz	433 MHz	533 MHz	1.1 GHz	1.4 GHz	2.0 GHz	2.1 GHz

*All Celeron III below 800 MHz use 66 MHz CPU bus, all Celeron III from 800 MHz through 1.1 GHz use 100 MHz bus.
SEPP = Single Edge Processor Package
FC-PGA = Flip Chip Pin Grid Array
FC-PGA2 = FC-PGA with added heat spreader
MMX = Multimedia extensions, 57 additional instructions for graphics and sound processing
SSE = Streaming SIMD (Single Instruction Multiple Data) Extensions, MMX plus 70 additional instructions for graphics and sound processing
SSE2 = Streaming SIMD Extensions 2, SSE plus 144 additional instructions for graphics and sound processing
The "Celeron Version" names listed here are not official; I made them up as a way to clearly identify the different Celeron processors.
The Celeron 4A version is not out yet, but will be introduced during the 3rd quarter of 2002.
Minimum and Maximum speeds indicate the slowest and fastest rated speeds of each variation offered.

The following figures show the different Celeron package types. These images are included courtesy of Intel.

Celeron/Celeron A SEPP (Slot-1):

Celeron A-PGA PPGA (Socket 370):

Celeron III FC-PGA (Socket 370):

Celeron IIIA FC-PGA2 (Socket 370):

Celeron 4 FC-PGA2 (Socket 478):

As you can see, there is a wide range of what is called a "Celeron", and in fact you could consider the Celeron as a family of 6 different core processor models in 5 different package variations. The Celeron IIIA and Celeron 4 are soon to be joined by the upcoming Celeron 4A version. All previous versions have been or are in the process of being discontinued.

The following sections discuss the differences between these different Celeron processors.Socket 370 versus Socket 478 Celerons

While both Socket 370 and Socket 478 processors bear the name "Celeron", there are enormous differences in internal design between Celeron processors in these form factors. These differences directly relate to which Intel Pentium-class processor a particular Celeron processor is based upon.

Socket 370 Celerons are based on various versions of the Pentium II and Pentium III architecture, while Socket 478 Celerons are based on the Pentium 4 architecture. This discussion focuses on the Celeron IIIA, Celeron 4, and Celeron 4A (previous versions have been discontinued).

Intel offers Celeron IIIA versions for new Socket 370 motherboards in speeds from 900 MHz to 1.4 GHz, Celeron 4 versions for Socket 478 motherboards in speeds from 1.7GHz to 1.8GHz (with 2.0 GHz coming); and faster Celeron 4A models in speeds from 2.0A GHz to 2.1 GHz are expected to arrive later this year.

What are the differences in these processors, other than clock speed?

All Celeron IIIA Celerons have a CPU bus (sometimes called FSB or front-side-bus) speed of 100MHz, while all Socket 478 Celerons have a CPU bus speed of 400MHz.
Celeron IIIA versions that are based on the Pentium III Tualatin core have 256KB of Level 2 cache, while those based on the earlier Pentium III Coppermine core or Pentium II Deschutes core have 128KB of Level 2 cache. All current Socket 478 Celerons based on the Pentium 4 Willamette core have 128KB of Level 2 cache, and newer versions based on the Northwood core are coming with 256KB of L2 cache.

How Tualatin, Willamette and Northwood Improve the Celeron

Compared to Celerons based on the previous Pentium III Coppermine core, Tualatin-based Celerons have the following differences:

Larger L2 memory cache (256KB versus 128KB)
Improved L2 cache design for better performance
FC-PGA2 packaging which includes a metal heat spreader over the fragile CPU core to protect it when attaching a heatsink

However, these improvements come at a cost in compatibility. Like the Tualatin-core versions of the Pentium III, Celerons based on the Tualatin core wont work in motherboards designed for older Pentium III or Celeron chips. While Socket 370 is physically the same, the Tualatin core redefines ten pins in the socket, which require corresponding changes in the chipset and motherboard. So, if youre looking for a way to speed up an older Celeron by installing a Tualatin-core Celeron IIIA, make sure the motherboard is "Tualatin-ready". Also note that Tualatin-core Celerons use the FC-PGA2 packaging, which includes a heat spreader on top of the CPU die. This requires a compatible heat sink.

Because of the variations in packaging, which require different heat sink solutions, I normally recommend only purchasing "boxed" versions of the processors, which include a compatible high quality heat sink in the box. That way you are assured of having the proper heat sink, clips, thermal interface material, and other items necessary to assure the chip will operate properly and safely in your system. The boxed processors also feature a 3-year warranty direct with Intel, which is not available with raw or "OEM" processors.

The following figure shows a "boxed" Celeron III processor:

The latest Celeron 4 processors are designed to provide a low-cost alternative to users of Socket 478 motherboards (the form factor used by recent and current Pentium 4 processors). Socket 478 Celerons currently use the Willamette core found in the original Pentium 4, but newer Celeron 4A versions will soon be released that use the Northwood core found in the latest Pentium 4 models. The only difference between a Celeron 4 or 4A and the Pentium 4 or Pentium 4A processors they are based on is that the Celeron versions have only half of the L2 cache as found in the corresponding Pentium 4 version. Compared to earlier Pentium III-based Celerons, the Pentium 4-based Celerons have the following improvements:

Faster clock speeds (up to 2.1GHz by early 2003 and climbing)
400MHz CPU bus for data and memory transfers up to 3.2GB/second (depending upon the memory used on the motherboard)
Support for SSE2 instructions, which include the SSE (Streaming SIMD Extension) instructions found in the Pentium III based Celerons plus 144 additional instructions for graphics and sound processing
Deeper 20-stage internal pipeline
256-bit wide L2 cache
All other Pentium 4 architectural features

Celerons with the Willamette-128 core have half the L2 cache found in the Pentium 4 Willamette processors, and Celerons with the Northwood-256 core have half of the L2 cache found in the Pentium 4 Northwood processors. Even though the Celeron 4 processors have only 128KB of L2 cache, the improvements in the cache architecture and CPU and bus speeds allow them to far outperform the previous Celeron IIIA versions with 256KB of L2. The upcoming Northwood based Celeron 4A will have 256KB of L2 and will perform even better than the current Celeron 4.

Essentially, you can consider the latest Celerons as economy versions of the Pentium 4, ready to plug into any Socket 478 motherboard as a lower-cost, lower-performance alternative to the "real" Pentium 4.

Visual Clues as to Whos Who

Fortunately, the external design of the different Celeron IIIA and newer processors makes it fairly easy to tell which processor is which.

All of the Celeron IIIA Tualatin-128 core Socket 370 Celeron chips (256KB of level 2 cache) use Intels FC-PGA2 design. This design adds a metal heat spreader to the top of the processor to improve heat transfer to the heatsink. This integrated heat spreader also prevents physical damage to the CPU during the processor and heat sink installation. Think of it as a metal protective cap over the CPU die.

All Pentium 4 based, Socket 478 Celerons also use FC-PGA2, but can be distinguished from Tualatin-based Celerons by the size of the processor: Socket 478 processors are actually smaller than Socket 370 processors, even though they have more pins. The smaller size is due to the fact that the pins are staggered in a grid with much closer spacing than on the previous designs.

Quick Reference Table for The Latest Celerons

Because Intel has offered Celerons in as many as seven distinctive variations, its easy to get confused as to which is which, or which was available at a specific speed. The following table lists every Celeron version released to date, which will help you keep the different models straight.

Celeron Version	Processor Speed	CPU Bus Speed	L2 Cache	Multi-Media Support	Package	Physical Interface	sSpec
Celeron 4	1.80 GHz	400 MHz	128KB	SSE2	FC-PGA2	Socket 478	SL6A2
Celeron 4	1.80 GHz	400 MHz	128KB	SSE2	FC-PGA2	Socket 478	SL68D
Celeron 4	1.70 GHz	400 MHz	128KB	SSE2	FC-PGA2	Socket 478	SL69Z
Celeron IIIA	1.40 GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL68G
Celeron IIIA	1.30 GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5ZJ
Celeron IIIA	1.30 GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5VR
Celeron IIIA	1.20 GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5Y5
Celeron IIIA	1.20 GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5XS
Celeron IIIA	1.10A GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5ZE
Celeron IIIA	1.10A GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5VQ
Celeron III	1.10 GHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5XU
Celeron III	1.10 GHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5XR
Celeron IIIA	1.0A GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5ZF
Celeron IIIA	1.0A GHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL5VP
Celeron III	1.0 GHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL635
Celeron III	1.0 GHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5XT
Celeron III	1.0 GHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5XQ
Celeron IIIA	950 MHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL634
Celeron III	950 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5V2
Celeron III	950 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5UZ
Celeron IIIA	900 MHz	100 MHz	256KB	SSE	FC-PGA2	Socket 370	SL633
Celeron III	900 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5WY
Celeron III	900 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5MQ
Celeron III	900 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5LX
Celeron III	850 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5WX
Celeron III	850 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5GB
Celeron III	850 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5GA
Celeron III	850 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5EC
Celeron III	850 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL54Q
Celeron III	800 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5WW
Celeron III	800 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5WC
Celeron III	800 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL5EB
Celeron III	800 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL55R
Celeron III	800 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL54P
Celeron III	800 MHz	100 MHz	128KB	SSE	FC-PGA	Socket 370	SL4TF
Celeron III	766 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL5EA
Celeron III	766 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL52X
Celeron III	766 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4QF
Celeron III	766 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4P6
Celeron III	733 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL52Y
Celeron III	733 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4P7
Celeron III	733 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4P3
Celeron III	700 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4P8
Celeron III	700 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4P2
Celeron III	700 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4E6
Celeron III	700 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL48F
Celeron III	667 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4P9
Celeron III	667 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4NZ
Celeron III	667 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4AB
Celeron III	667 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL48E
Celeron III	633 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4PA
Celeron III	633 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4NY
Celeron III	633 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL3W9
Celeron III	633 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL3VS
Celeron III	600 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4PB
Celeron III	600 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4NX
Celeron III	600 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL46U
Celeron III	600 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL3W8
Celeron III	566 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4PC
Celeron III	566 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL4NW
Celeron III	566 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL46T
Celeron III	566 MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL3W7
Celeron III	533A MHz	66 MHz	128KB	SSE	FC-PGA	Socket 370	SL46S
Celeron A-PGA	533 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3PZ
Celeron A-PGA	533 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3FZ
Celeron A-PGA	500 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3LQ
Celeron A-PGA	500 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3FY
Celeron A-PGA	466 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3FL
Celeron A-PGA	466 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3EH
Celeron A-PGA	433 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3BS
Celeron A-PGA	433 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3BA
Celeron A-PGA	400 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL3A2
Celeron A	400 MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL39Z
Celeron A-PGA	400 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL37X
Celeron A	400 MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL37V
Celeron A	366 MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL37Q
Celeron A	366 MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL376
Celeron A-PGA	366 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL36C
Celeron A-PGA	366 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL35S
Celeron A-PGA	333 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL36B
Celeron A-PGA	333 MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL35R
Celeron A	333 MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL32B
Celeron A	333 MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL2WN
Celeron A-PGA	300A MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL36A
Celeron A-PGA	300A MHz	66 MHz	128KB	MMX	PPGA	Socket 370	SL35Q
Celeron A	300A MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL32A
Celeron A	300A MHz	66 MHz	128KB	MMX	SEPP	Slot-1	SL2WM
Celeron	300 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2Z7
Celeron	300 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2YP
Celeron	300 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2Y2
Celeron	300 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2X8
Celeron	300 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL27Z
Celeron	266 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2YN
Celeron	266 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2TR
Celeron	266 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2SY
Celeron	266 MHz	66 MHz	0KB	MMX	SEPP	Slot-1	SL2QG

The sSpec values listed here can be found printed on the chip for reference. By reading the sSpec number off a chip and looking the number up on the Intel developer website, you can find out the exact voltage, stepping, and other information in addition to what is listed here.

Which Celeron for You?

If you want to upgrade an older Socket 370-based system, Celeron III versions based on the original Pentium III design can be useful upgrades. However, since they have been discontinued their supply is drying up. For example, the online TC Computers store recently offered just one model, a 1GHz version, for about $77.

The Celeron IIIA processors with the Tualatin-128 core enable you to build a low-cost system based on Tualatin-compatible motherboards or upgrade a system with a slower processor. Keep in mind that older Socket 370 motherboards might not work with Tualatin-core processors; check with the motherboard vendor for details. However, if you can use the Tualatin core and dont mind running the CPU and memory bus at 100MHz instead of 133MHz, youll save a lot of money with a Celeron over a Pentium III. For example, TC Computers recently offered a 1.3GHz Tualatin-based Celeron for about $90, compared to about $245 for a 1.26GHz Pentium III Tualatin.

However, if youre looking to the long term, you should consider the Pentium 4 based Socket 478 versions of Celeron instead. Since Intel has abandoned the Pentium III architecture and Socket 370 along with it, the present and foreseeable future is Socket 478 and motherboards that use the newer Pentium 4 architecture.

The latest Celeron 4 versions are much less expensive than Pentium 4 processors. For example, TC Computers recently offered 1.7GHz boxed Celeron 4 processors (Socket 478) for about $99, while the 1.8GHz boxed Pentium 4 also using Socket 478 was offered for about $190 to $200.

Since current Celeron 4 processors have 128KB of Level 2 cache, compared to 256KB or 512KB in the Pentium 4 processors, theyll perform some tasks more slowly. The new Celeron 4A processors that are coming shortly will narrow the gap. However, if you want to build a Pentium 4-ready system today at a low cost, the Celeron 4 processors based on the Pentium 4 make it possible.

For Further Research

Celeron Information

Look up the official specifications and documentation for the Celeron at:

http://developer.intel.com/design/celeron

Click on the Processor Spec Finder and select your processor model, clock speed, packaging type, and core clock speed for more information.

You can also download Intels Processor Specification Updates for Socket 370 and Socket 478 Celerons show you how to identify them visually and how different models vary internally (voltage, cache size, and other factors).

You can learn much more about all of the Processors in my new book "Upgrading and Repairing PCs, 14th edition". In the near future, you will also find a great deal of useful information on the subject presented visually in my new Upgrading and Repairing PCs Video Training Course.

See more about my latest books and videos at:
http://www.upgradingandrepairingpcs.com/books_by_scott/

Shopping and Price Comparisons

Do your own price comparisons between Celerons and Pentium III or Pentium 4 processors at:

http://www.tccomputers.com

http://www.aberdeeninc.com

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This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security

Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children

This site is not directed to children under the age of 13.

Marketing

Pearson may send or direct marketing communications to users, provided that

Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
Such marketing is consistent with applicable law and Pearson's legal obligations.
Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out

Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

As required by law.
With the consent of the individual (or their parent, if the individual is a minor)
In response to a subpoena, court order or legal process, to the extent permitted or required by law
To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
To investigate or address actual or suspected fraud or other illegal activities
To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links

This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020

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