ECC Registered DIMMs & ECC UDIMMs can not be mixed. If your system came with ECC UDIMMs then use of registered DIMMs will require removal of all exisiting UDIMMs. Operational memory speed is controlled by CPU type and number of DIMMs installed.
Memgate takes pride in offering quality computer products at exceptionally low prices and our customer service is second to none. Over 24 years in business. Over 700,000 satisfied customers. The item "128GB (8x16GB) DDR3 -1333 ECC Reg Memory for Apple Mac Pro Mid 2010 5,1 12 Core" is in sale since Thursday, July 18, 2019. This item is in the category "Computers/Tablets & Networking\Computer Components & Parts\Memory (RAM)".The seller is "memgate" and is located in Lake Forest, California. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia, South africa, New Zealand, Egypt, Reunion.