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The Pentium III provided two execution units on one chip. This is sort of like two cores, but with important limitations. The issue is that the two execution units share the same high level bus interface. This means that the two threads considered for simultaneous dispatch must be in the same address space, i.e. in the same process. This is wonderful for programs designed to use multi-threading, but does nothing for two programs running as two different processes. The Dual Core architecture moved the dividing line down further into the bus interface. Now the OS can dispatch both execution units, even if they are running in different address spaces.

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14y ago
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14y ago

Its XEON because of its high front side buss and higher floating point. Also the die is considerable smaller than celeron to give more performance to heat ratio.

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Q: What is the difference between an Intel Pentium Dual-Core processor and the Intel Pentium III Xeon processor?
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