A-Tech For Apple 16GB Kit 4 x 4GB PC2-5300 667MHz Mac Pro MacPro2,1 MacPro1,1 Mid 2006 A1186 MA356LL/A Memory RAM 16GB Kit 4x 4GB (4 x 4GB) DIMM DDR2 ECC Fully Buffered PC2-5300 667MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Mac Pro Models: MA356LL/A A1186 MacPro1,1 MacPro2,1