The 32GB DDR3 1866 MHz DIMM Memory Module Kit from OWC / Other World Computing consists of two 8GB DDR3 DIMM memory modules. Each module has a clock speed of 1866 MHz and 240-pin DIMM form factor. In addition, it is RoHS certified.
IMPORTANT: Mac Pro (Late 2013) models utilize thermal enabled ECC Registered and ECC non-Registered memory, however ECC Registered and ECC non-Registered memory cannot be combined. If you are adding ECC Registered memory in a system with ECC non-Registered memory, you will need to remove the original ECC non-Registered memory prior to installing the ECC Registered memory.