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Intel Pentium processors have a 32-bit word, whereas Core 2 and later processors have a 64-bit word. Prior to the Core 2, Intel manufactured some high-end Xeon processors for the server and workstation market that also had a 64-bit word length.

Complicating the picture a bit, for many modern microprocessors, is the presence of special long-word-length registers and operations to support multimedia processing (among other compute-intensive operations). For example, SSE2 (Streaming SIMD Extensions-2) support in current microprocessors from Intel and AMD incorporates a number of 128-bit registers and instructions, significantly increasing the computing power of these processors.

*The processors that use and/or have used both a 32-bit word size and a 64-bit word size are the Celeron, and Xeon, and they are considered to be in the Pentium class.

Xeons currently do not make the processors with both anymore, so the more current Xeons are not considered Pentiums, but older ones are.

Page 190 of CompTIA A+ Guide to Managing & Maintaining Your PC, 6th Edition: Chapter 5 "Pentiums and Chipsets" has more about this topic.

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Q: Which group of Intel processors use a 32-bit word size and a 64-bit word size?
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Which group of Intel processors uses a 32-bit word size and a 64 bit word size?

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