THIS AUCTON IS FOR A SAMSUNG ORIGINAL 64GB SET ( 4 X 16GB MODULES) DDR3 PC3-10600 1333MHz CL9 1.5V 2RX4 ECC REGISTERED. THEY ARE DESIGNED TO WORK IN THE APPLE MAC PRO 5,1 WESTMERE. IT WILL WORK IN THE FOLLOWING MODELS 

Apple Mac Pro "Twelve Core" 3.06Mac Pro  - BTO/CTO - MacPro5,1 - A1289 - 2629Apple Mac Pro "Twelve Core" 2.93Mac Pro  - BTO/CTO - MacPro5,1 - A1289 - 2314Apple Mac Pro "Twelve Core" 2.66Mac Pro - BTO/CTO - MacPro5,1 - A1289 - 2314/2629