ADDON HP 604502-B21 COMP 8GB DDR3-1333MHZ ECC 1.35V DR RDIMMAddOn 8 GB DDR3 SDRAM Memory Module For Server 8 GB (1 x 8GB) DDR3 1333 PC3 10600 DDR3 SDRAM 1333 MHz Dual rank Memory CL9 1. 35 V ECC Registered 240 pin RDIMM Lifetime Warranty VPN: 604502 B21 AM SKU: RSC579908 UPC: 821455331798 RDIMM 8 GB bar will run multiple applications together and enhance your computer's performance Up to 1333 MHz memory speed with Registered signal and CL9 to manage your routine softwares with pace and accuracy DDR3 SDRAM