2006 Apple Mac Pro 1,1 Quad Core Intel Xeon 2x 2.66GHz OSX 10.11.6 8GB A1186 | eBay
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Mac Pro 12-Core: Two 2.66GHz Intel Xeon 16GB 1TB Super Drive Intel Xeon 2010 - Refurbished
2006 Apple Mac Pro 1,1 Quad Core Intel Xeon 2x 2.66GHz OSX 10.11.6 8GB A1186 | eBay
Mac Pro - Wikipedia
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Mac Pro "Quad Core" 2.66 (Original) Specs (Mac Pro, MA356LL/A, MacPro1,1*, A1186, 2113): EveryMac.com
Mac Pro 1.1 Upgrade CPU's part 1 (2 Intel Xeon X5355 Quad Core 2.66) - YouTube
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OWC 12-Core 2.66GHz Intel Xeon X5650 Westmere Dual... at MacSales.com
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Mac Pro "Quad Core" 2.66 (2009/Nehalem) Specs (Early 2009, MB871LL/A, MacPro4,1, A1289, 2314): EveryMac.com
Apple goes to Harpertown: a review of the new Mac Pro | Ars Technica
