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The lower models in the 2006 line used 32-bit processors, including MacBooks, iMacs and Mac Minis, while more expensive models favoured the 64-bit Core 2 Duo processors.

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That's not accurate; first generation MacBook Pros used 32-bit Core Duo processors as well, as did almost all the early-2006 models; the exception being the lowest-end Mac Mini, which had a single-core 32-bit Core Solo. 32-vs-64-bit was never used for price differentiation within a lineup; Intel's 64-bit chips just weren't ready in time.

Late-2006 models, including the first-generation Mac Pro, moved from the 32-bit Yonah Core Duo/Core Solo architecture to the 64-bit Conroe Core 2 Duo.

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