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.
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.
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