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All Apple Mac Pro Specs (2006-Current): EveryMac.com
Mac Pro - Wikipedia
Apple Mac Pro "Quad Core" 2.66 (Original) Specs - EveryMac.com
Mac Pro (2006) review - Macworld
Mac Pro (Tower, Mid 2006) / 2.66 GHz 2 x 2-Core Xeon 5150 / …
Mac Pro (1st generation) - Apple Wiki
Mac Pro Overview, 2006 to 2012 - Low End Mac
Mac Pro 2006 brings serious Intel power: Today in Apple history
Apple Unveils New Mac Pro Featuring Quad 64-bit Xeon Processors
Mac Pro review - Ars Technica