Kingston 8GB 1066MHz DDR3 DIMM Desktop Memory With Thermal Sensor For Select Mac Pro's KTA-MP1066QR/8G
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 one 8GB module of 1066MHz DDR3  memory. Specs are, standard 1Gx72 ECC 240-pin Registered DIMM, Quad Rank  DDR3, 1.5V, CL7, FBGA, Gold, X8.