As was the case with the earlier IA32 processors starting with the Pentium® II, Intel® sells three product lines based on the Pentium® 4 processor:
The Pentium® 4 desktop processors.
The Pentium® 4 Celeron for low-cost, single-processor systems.
The Pentium® 4M product line for notebooks. This product line is being eliminated and the Pentium® M processor is taking its place.
The Pentium® 4 Xeon product line which is divided into two products: the Xeon DP and the Xeon MP.
All of them are derivatives of the basic Pentium® 4 processor.
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