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What's the difference between Intel's pentium, CELERON AND XEON microprocessors?

Pentiums are the workhorse chips found in most PCs in the $1,000-to-$2,500 range. The fastest are Pentium IIIs that run at 500 MHz, perfect for 3-D games like the upcoming Quake III. Celerons are discount chips found in many sub-$1,000 PCs. They are cheaper and slower because they have less short-term cache memory. Xeons are Intel's fastest chips (with up to four times the cache of Pentiums) and are used only for corporate servers.

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