661-4679 2 GB, DDR2, FB-Dimm, 800, ECC - Early 2008 A1186 Mac Pro 2.8-3.0-3.2GHz NB-2212W This is 2GB DDR2 PC2-6400 RAM upgrade for the Mac Pro. This is for PC2-6400 DDR2 Machines. These are DIMM chips and not SODIMM chips used in MacBooks and iMacs. Apple part number: 661-4679