The OWC 1866D3R9M64 is a 64GB memory upgrade kit consisting of 4 x 16.0GB memory. This OWC memory kit is compatible with MacPro 2013.
OWC Memory for Mac Pro 2013 fully meets Apple's specifications with special attention to proper thermal specifications.
IMPORTANT MAC PRO 2013 UPGRADE NOTE:
Apple Mac Pro 2013 models utilize thermal enabled ECC-Registered and ECC non-Registered memory. ECC Registered and non-Registered memory may not be mixed. Existing factory or post installed 4GB or 8GB ECC non-Registered modules need to be removed prior to installation of OWC 8GB, 16GB, or 32GB server grade ECC-Registered memory upgrades.