The document compares specifications for three Mac models: the Power Mac G5 2.0 (DC), Mac Pro 2.8 (2008), and Mac Pro 2.66 (Orig). It provides a side-by-side table allowing comparison of key specs like processor, RAM, storage, ports, and dimensions. Complete individual specs for each model are available by clicking on the "Complete Specs" link. The comparison tool allows selecting any three Mac models to dynamically compare their specs.