4GB DDR3-1600 LV UDIMM FOR HP - 713977-B21Axiom Memory Axiom 4GB DDR3 1600 Low Voltage ECC UDIMM for HP Gen 8 713977 B21 For Server 4 GB DDR3 1600 PC3L 12800 DDR3 SDRAM 1600 MHz ECC 240 pin UDIMM Lifetime Warranty VPN: 713977 B21 AX SKU: RSC679986 UPC: 845282084689 4 GB memory allows you to have more programs open at a time 1600 MHz of memory speed skillfully manages the variety of apps and computational tasks 240 pin pin DDR3 1600 PC3L 12800 interface synchronizes electrical and clock