Kingston 16 GB Kit (4 x 4 GB Modules) 1066MHz DDR3 DIMM Desktop Memory With Thermal Sensor For Select Mac Pro's KTA-MP1066K4/16G
Kingston is the industry leader in PC memory. Kingston is your best source for system-specific memory. Product is backed by a lifetime warranty and free technical support. Included in the package is four 4GB modules of 1066MHz DDR3 memory. Specs are, 240-pin unbuffered DIMM, ECC.