HP 397415-B21 COMP 8GB DDR2-667MHZ ECC DR FBDIMM KITAddOn FACTORY ORIGINAL 8GB (2x4GB) DDR2 667MHZ DR DIMM F HP For Server 8 GB (2 x 4GB) DDR2 667 DDR2 SDRAM 667 MHz Dual rank Memory CL5 1. 80 V ECC Fully Buffered 240 pin DIMM Lifetime Warranty VPN: 397415 B21 AM SKU: RSC387977 UPC: 821455232637 8 GB capacity is enough to execute all memory hungry programs simultaneously DIMM 8 GB bar will run multiple applications together and enhance your computer's performance 667 MHz speed and Fully Buffered signal