2009-2013 Nehalem Mac Pro memory 32GB 4X 8GB DDR3-1066 PC3-8500 

This 32GB (4 X 8GB) DDR3 PC3-8500R 1066MHz CL7 1.5V 2RX4 240PIN DIMMs upgrade kit is for the 2009-2013 Nehalem Mac Pro models. The Mac Pro can use either ECC UNBUFFERED or ECC REGISTERED DIMMS, but they cannot be mixed. These are ECC REGISTERED, so remove all UNBUFFERED DIMMS before installing.

This memory has a lifetime replacement warranty and works with the following models: 

Mac Pro "Quad Core" 2.66 (2009/Nehalem)2.66 GHz Q. Core Xeon W3520

Mac Pro "Quad Core" 2.93 (2009/Nehalem)2.93 GHz Q. Core Xeon W3540

Mac Pro "Quad Core" 3.33 (2009/Nehalem)3.33 GHz Q. Core Xeon W3580

Mac Pro "Eight Core" 2.26 (2009/Nehalem)2.26 GHz Q. Core Xeon E5520 x2

Mac Pro "Eight Core" 2.66 (2009/Nehalem)2.66 GHz Q. Core Xeon X5550 x2

Mac Pro "Eight Core" 2.93 (2009/Nehalem)2.93 GHz Q. Core Xeon X5570 x2

Mac Pro "Quad Core" 2.8 (2010/Nehalem)2.8 GHz Q. Core Xeon W3530

Mac Pro "Quad Core" 3.2 (2010/Nehalem)3.2 GHz Q. Core Xeon W3565