661-3921 Processor, Dual Core, 2.66 GHz - A1186 2-2.66-3GHz Quad - 3GHz 8-Core, Mac Pro NB-2207W This is a single 2.66GHZ processor for a Dual Core 2.66GHZ 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: 661-3921