661-4308 Quad Core Processor, Mac Pro 3GHz 8-Core A1186 NB-2201W Apple part number: 661-4308, Compatible models: A1186-2006-MA356LL/A, A1186-2006, A1186-2006, Compatible Mac info. : 2.66GHz Quad-Core Mac Pro , 3.0GHz Quad-Core Mac Pro , 3.0GHz 8-Core Mac Pro, 661-4308 Quad Core Processor, Mac Pro 3GHz 8-Core A1186 Apple part number: 661-4308