661-4083 Dual Core, GHz, Processor - A1186 Mac Pro 2.66GHz Quad NB-2056W This is a single 2.0GHZ processor for a Dual Core 2.0GHZ Mac Pro. (This is not two processors, it is just one.) This is a pull from a working unit and comes with our standard 1 year warranty. Apple part number: 661-4083