AddOn 4GB DDR3 SDRAM Memory Module - 4 GB DDR3 SDRAM - 1600 MHz - 1.35 V - ECC - Registered - 240-pin - RDIMM - Lifetime Warranty

HP® 713754-071 Compatible Factory Original 4GB DDR3-1600MHz Registered ECC Single Rank x4 1.35V 240-pin RDIMM