Intel Celeron processor families

Intel Celeron family is a line of budget x86 processors based on Pentium designs. Originally based on Intel Pentium II architecture, the Celeron processors migrated over time to Pentium III, NetBurst (Pentium 4) and Core architectures. Priced lower than their Pentium counterparts, the Celeron processors have certain high-end processor features disabled. For example, P6-based Celerons had multiprocessing disabled, while more modern CPUs may have disabled Hyper-Threading, Virtualization, AES instructions, and/or other features. The Celerons are slower than similar-clocked Pentiums due to smaller size of L2 cache, and possibly slower bus speed. Celeron CPUs are usually packaged the same way as Pentium or Core-branded processors, and can be used in motherboards designed for Pentium/Core microprocessors. For more information about the differences between Celeron and Pentium CPUs please see Celeron vs Pentium page.

Distinguishing between different generations of Celeron desktop processors is easy because they used different package types. Celerons based on Pentium II core were packaged either in Slot 1 or plastic PPGA package. Intel Celeron chips, based on Pentium III core, were manufactured in FC-PGA package. NetBurst generation of Celeron microprocessors were packaged in 478-pin package with integrated heatsink. Core-based Celerons were produced in 775-land LGA (pinless) package, compatible with socket 775.

In addition to Celeron processors, there were a few Intel families that used "Celeron" brand name as part of the name. These were:

  • Celeron D - a line of desktop budget CPUs built on NetBurst micro-architecture.
  • Celeron M - a group of families of single-core mobile microprocessors.
  • Celeron Dual-Core - a family of budget dual-core CPUs, that spanned a few different micro-architectures. This family was eventually re-branded as "Celeron".
  • Mobile Celeron Dual-Core - a line of mobile dual-core microprocessors for value market. The family is branded now as "Mobile Celeron".

For averaged multi-threading performance of Celeron CPUs please see Intel Celeron performance pages.

Use the filter below to display families that have specific feature(s) incorporated:
32-bit 64-bit

List of Celeron families

Intel Celeron 266 MHz

266 MHz
No L2 cache
Single Edge Processor package (slot 1)

Engineering sample
Front view
Image reduced 2x times

Celeron 266 based on Covington core was the first processor from Celeron series. While this processor had poor performance due to lack of L2 cache, it was very popular because with its low price and very high overclockability the CPU had very good price/performance ratio. Many Celerons 266 could be easily overclocked to 400 MHz by changing bus frequency from 66 MHz to 100 MHz. Even if the microprocessor wasn't running stable at 400 MHz, it was still possible to run it at 333 MHz by changing bus frequency to 83 MHz.

Picture of: Intel Celeron 266 MHz

Intel Celeron 366 MHz - FV80524RX366128 / FV524RX366 128

All Intel Celeron processors in PPGA package were based on Mendocino core. Mendocino was the first Intel x86 core that integrated level 2 cache with the core (Pentium Pro had level 2 cache on a separate die, and Pentium II processors used external cache chips). The core had only 128 KB of level 2 cache, but smaller cache size was partially compensated by faster cache speed - it was running twice as fast as the Pentium II level 2 cache. The Mendocino core didn't require external cache chips, therefore it could fit on smaller and cheaper Plastic Pin Grid Array (PPGA) package. To work with the Celeron PPGA package Intel designed new 370-pin socket - socket 370, or PGA370.

Picture of: Intel Celeron 366 MHz - FV80524RX366128 / FV524RX366 128

Intel Celeron 950 MHz - RB80526RY950128 / BX80526F950128

Second generation of socket 370-compatible Celeron processors was based on Coppermine core. Like the Mendocino core, the Coppermine core had level 2 cache integrated on the die. The size of level 2 cache didn't change from older PPGA Celerons - it was 128 KB, or half the size of L2 cache of Pentium III Coppermine processors. The cache itself was improved - it featured 256-bit wide path to the cache and had lower latency than the cache of PPGA processors. Another enhancement in Coppermine Celerons was addition of SSE instructions, which could significantly boost processor performance in SSE-enabled applications. Core voltage of the Coppermine processors was reduced from 2.0 Volt to 1.5 - 1.75 Volt, which resulted in lower power consumption and cooler running processors. New package type of these Celerons, with processor die exposed on the top of the chip, also allowed better processor cooling. Coppermine Celeron microprocessors required revised socket 370 - this socket was mechanically, but not electrically compatible with PPGA Socket 370, which made all Copermine CPUs incompatible with many old Socket 370 motherboards.

Picture of: Intel Celeron 950 MHz - RB80526RY950128 / BX80526F950128

Intel Celeron 1.4 GHz - RK80530RY017256 / BX80530F1400256

The last generation of socket 370 Celeron processors featured Tualatin core with 256 KB level 2 cache, often called as Tualatin-256. Having twice as much cache as Coppermine Celerons, these microprocessors performed as fast as Pentium III Copermine processors running at the same Front Side Bus frequency (100 MHz). Besides larger level 2 cache, the Celerons also had lower core voltage and power consumption. The package of these processors was modified. It still used Flip-Chip packaging technology, where the processor die was mounted upside down on the top of the plastic package, but on Tualatin Celerons the die was covered by integrated heatsink. Like the Pentium III Tualatin CPUs, the Celerons used new bus interface, and, though the Celerons could fit into older socket 370 motherboards, the processors couldn't work in them. It was still possible to use special Tualatin socket 370 adapters to run Tualatin Celeron processors in old motherboards.

Picture of: Intel Celeron 1.4 GHz - RK80530RY017256 / BX80530F1400256

Intel Celeron 1.6 GHz - RK80531RC025128

Intel Celeron Willamette processors were the first Celerons based on NetBurst micro-architecture. Willamette Celeron CPUs featured 400 MHz Front-Side Bus, long 20-stage pipeline, SSE2 instructions and enhanced branch prediction. These Celeron processors were produced using 0.18 micron technology and had the same voltage as Pentium 4 Willamette processors. Level 2 cache size on the Celeron microprocessors was twice smaller than on Pentium 4, which resulted in about 10% lower performance of Celeron processors. Smaller L2 cache was the only difference of these CPUs from Pentium 4 processors with the same core.

Picture of: Intel Celeron 1.6 GHz - RK80531RC025128

Intel Celeron 2.1 GHz - RK80532RC045128 / BX80532RC2100B

The next generation of Celeron-branded microprocessors was based on Pentium 4 Northwood core. These Celerons were produced on 0.13 micron technology, and had almost the same microarchitecture as Pentium 4 Northwood microprocessors with a few exceptions. Even though the size of L2 cache was doubled on Pentium 4 Northwood processors, Northwood Celerons had the same 128 KB L2 cache as their predecessors - Willamette Celeron. Front Side Bus frequency of Celeron processors was also unchanged. Celeron microprocessors didn't include Hyper-Threading technology that was present on all Pentium 4 Northwood CPUs with 800 MHz FSB. On a plus side, the Northwood Celerons had lower core voltage than their Willamette processors, as a result Northwood processors ran cooler. The Celeron CPUs were packaged in 478-pin FC-PGA2 package with integrated heatsink, and required socket 478 motherboards.

Picture of: Intel Celeron 2.1 GHz - RK80532RC045128 / BX80532RC2100B

Intel Celeron 430 - HH80557RG033512 / BX80557430 / BXC80557430

Celeron 400 series family was the first family of low-cost desktop CPUs based on Core micro-architecture. The 400 series processors include basic features of the Core microarchitecture - 64-bit processing, Execute Disable bit, enhanced branch prediction, support for SSE3 and Supplemental SSE3, quad-pumped Front-side Bus, and others. As usual for all budget processors, these Celerons do not include as many features, or have inferior features as compared to desktop high-performance CPUs. The Celeron 400 series include only single CPU core, small 512 KB level 2 cache, and they do not have Enhanced SpeedStep technology.

Picture of: Intel Celeron 430 - HH80557RG033512 / BX80557430 / BXC80557430

Celeron 445 is the only known Celeron-branded microprocessor with Conroe-CL core. As the core name suggests, it's a variation of Conroe core, and it borrows all major features from that core: Wide Dynamic Execution with ability to execute up to 4 instructions per cycle, 64 KB level 1 cache, 512 KB level 2 cache, 64-bit instruction set, and SSE/2/3 extensions with Advanced Digital Media Boost, that improves performance of 128-bit SIMD instructions. The Celeron 445 processor has only one core, and runs at 1.86 GHz. The CPU has faster FSB than Controe-L processors - 1066 MHz as opposed to 800 MHz for Celeron 400 series. The 445 model also includes Virtualization and SpeedStep technologies, which are not present on Celeron 400-series CPUs. Despite of it's brand, the Celeron 445 was designed for servers, albeit cheap ones, and therefore it is packaged in 771-land LGA package, that fits socket 771 motherboards.
Intel Mobile Celeron 433 MHz - KC80524KX433128

Mobile Celeron microprocessors with Mendocino core share many features with desktop Mendocino CPUs. All Mendocino Celerons are based on P6 micro-architecture, have 32 KB level 1 cache, integrate 128 KB level 2 cache running at the CPU speed, and, like almost all others P6 CPUs, support MMX instructions. Mobile Celerons have much lower power consumption than desktop Mendocino processors partly due to lower core voltage (1.6 Volt as opposed to 2 Volt for desktop processors), and partly due to two new power-saving modes - Quick Start and Deep Sleep. The Mobile Mendocino CPUs are packaged into 615-pin micro-PGA or 615-ball BGA packages - these packages are much smaller than 370-pin PPGA package of desktop microprocessors.

Picture of: Intel Mobile Celeron 433 MHz - KC80524KX433128

Intel Mobile Celeron 400 MHz MMC-1 - PMH40001001ES

400 MHz
128 KB L2 cache
MMC-1 package

Engineering sample
Top view
Image reduced 2x times

Picture of: Intel Mobile Celeron 400 MHz MMC-1 - PMH40001001ES

Intel Mobile Celeron 750 MHz - KP80526NY750128 / BXM80526B750128

750 MHz
128 KB L2 cache
495-pin micro-PGA2

Picture of: Intel Mobile Celeron 750 MHz - KP80526NY750128 / BXM80526B750128

Mobile Coppermine-T microprocessors combine features from two different Celeron cores: Coppermine and Tutalatin. Like Coppermine processors, the Coppermine-T CPUs are manufactured using 0.18 micron technology, have the same size and of L1 and L2 caches, similar CPU features, and approximately the same core voltage and power consumption. Unlike the Coppermine core, the Coppermine-T core uses newer low-power AGTL system bus, and can work in motherboards designed for Tualatin processors. Bus frequency of Coppermine-T Celerons was increased from 100 MHz to 133 MHz, and two low-power modes - Stop Grant and Sleep - were removed. The Coppermine-T processors were packaged in 478-pin micro-FCPGA and 479-ball micro-FCBGA packages, that is the same packages as mobile Tualation CPUs.
Intel Mobile Celeron 2 GHz - RH80532NC041256

2 GHz
400 MHz FSB
256 KB L2 cache
478-pin micro-FCPGA

Picture of: Intel Mobile Celeron 2 GHz - RH80532NC041256

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At a glance

32, 64-bit microprocessor
April 15, 1998
Technology (micron):
0.022 - 0.25
The number of cores:
1 - 4
Frequency (MHz):
266 - 2800
L2 cache size (MB):
0 - 2