OWC 128GB (4 x 32GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible With Mac Pro Late 2013 models Compatible with Mac Pro Late 2013 Model ID: MacPro6,1 3.7GHz 4-Core Xeon & 3.5GHz 6-Core Xeon & 3.0GHz 8-Core Xeon & 2.7GHz 12-Core Xeon Product Specs - 128GB (4x32GB) ; PC Speeds - 10600 ; Form Factor - Dimm DDR3 ECC-R ; Data Rate - 1333MT/s ; 240-pin ; Fully compliant with JEDEC specifications ; Chip Architecture - 2048M x 72 ; Unleash the true speed and performance of your system and applications. Experience increased efficiency and productivity. Open more apps and files, all at the same time. We test every OWC memory module at our in-house lab so you can upgrade with the confidence that your memory is built-to-last. We built your OWC Memory upgrade to meet or exceed the toughest industry specs to provide years of worry-free service. NOTE : Apple Mac Pro 2013 models utilizes ECC non-Registered for 4GB and 8GB per slot options and ECC Registered for 16GB (and larger) per slot options. Any existing 4GB and 8GB ECC non-Registered modules cannot be mixed with 16GB and larger ECC-Registered modules and will need to be removed in order to utilize these higher density memory upgrade options. Special 32GB module use information: Due to processor design and memory architectures, 32GB module utilization occurs at a bus speed of 1066MHz with Apple Mac Pro 2013 E5-16XXv2 4-Core, 6-Core, and 8-Core processor equipped models, 800MHz with factory 12-Core or after-market E5-26XX equipped models. Utilization of 2 or more 32GB modules minimum is recommended. Overall performance with applications and workflows that are able to utilize higher available memory, remains exceptional.