What Makes A Xeon A Xeon?

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There's something I've always wondered, what makes a Xeon a Xeon?

For instance, what is the difference between a Core 2 Quad Q9300 and a Quad-Core Xeon E5420. Both are quad core, have a 1333MHz FSB, run at 2.5GHz, have SSE4.1, any all the specs seem identical.

Only difference I see is the Xeon has 12MB cache compared to the Q9300's 6MB.

But generally speaking, what makes a Xeon such much better for a server environment than a Core 2 processor.