Apple Mac Pro 12-Core 2.66GHz Intel Xeon Westmere compatible Black Diamond memory 8GB DDR3 ECC UDIMM 1066MHz. Compatible computer model: Apple Mac Pro Z0G1, Quad-Core MC560LL/A Mid 2010, Quad-Core 3.2GHz Intel Xeon Nehalem, 2.7GHz 12-Core Xeon E5 2013, 6-Core 3.33GHz Intel Xeon Westmere, 12-Core 2.93GHz Intel Xeon Westmere, MD771LL/A, MC250LL/A 2.8GHz Quad-Core Intel Xeon, 2.8GHz Quad-Core (2009), MD87810 3.0GHz 8-Core Xeon E5 2013, 12-Core 2.66GHz Intel Xeon Westmere, MC561LL/A (8-Core 2.4GHz Intel Xeon Westmere), Z0G8, Z0LF One 3.2GHz Quad-Core Intel Xeon, 2.66GHz Quad-Core Xeon (MB871LL/A), Z0LF One 3.33GHz 6-Core Intel Xeon, MC250LL/A (Quad-Core 2.8GHz Intel Xeon Nehalem). Black Diamond Memory offers the most extensive line of memory solutions today. With our decades of experience specializing in memory, Black Diamond Memory is a proven manufacturer to the semiconductor industry. Our great products combined with our world class service and support have helped us to where we are today. When you have an Black Diamond memory chip, you can count on it being the best available memory for your system. Our system specific Branded Memory line delivers in performance, and is designed to be guaranteed in compatibility with your system. Each of our memory chips come with a lifetime warranty for your peace of mind. Use our Upgrade Configurator to easily find the correct memory module for your system. Please keep in mind that this memory will ONLY work on the models listed above. 15% Restocking fee will apply for non-defective items.