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Intel Core 2 Duo Quad and Core 2 Extreme

The Core 2 Quad range includes both 65nm and 45nm parts, based on the Kentfield and Yorkfield cores respectively. Internally, they're effectively a pair of Core 2 Duo processors built into one chip. As AMD likes to point out, this is less efficient than the Phenom's fully integrated design, as cores on different dies can't communicate directly at the chip's full internal speed. Instead, they have to pass data back and forth via the slower front side bus.

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