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 and Pentium 4 architectures. Priced lower than their Pentium counterparts, the Celeron processors have certain high-end processor features disabled (like dual processing or multiprocessing). The Celerons are also slower than similar-clocked Pentiums due to smaller L2 cache size and sometimes slower bus speed. Celeron CPUs are usually packaged the same way as Pentium II/III/4 processors and can be used in motherboards designed for Pentium II/III/4 processors (see Celeron vs Pentium for more information).
Distinguishing between generations of Celeron desktop processors is easy because different generations of Celeron processors used different package types. Celerons based on Pentium II core was packaged either in Slot 1 or plastic PPGA package. Celerons based on Pentium III core was manufactured in FC-PGA package. Pentium 4 generation of Celeron processors is packaged in 478-pin FC-PGA2 package.266 MHzNo L2 cacheSingle Edge Processor package (slot 1)Engineering sampleFront viewImage reduced 2x timesCeleron 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.
Distinguishing between generations of Celeron desktop processors is easy because different generations of Celeron processors used different package types. Celerons based on Pentium II core was packaged either in Slot 1 or plastic PPGA package. Celerons based on Pentium III core was manufactured in FC-PGA package. Pentium 4 generation of Celeron processors is packaged in 478-pin FC-PGA2 package.266 MHzNo L2 cacheSingle Edge Processor package (slot 1)Engineering sampleFront viewImage reduced 2x timesCeleron 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.
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