661-4612 Dual Core, Processor, 2.0 GHz, Version 2 - 2-2.66-3GHz Quad - 3GHz 8-Core A1186 Mac Pro NB-2206W Apple part number: 661-4612, 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, 661-4612 Dual Core, Processor, 2.0 GHz, Version 2 - 2-2.66-3GHz Quad - 3GHz 8-Core A1186 Mac Pro Apple part number: 661-4612