AddOn 16GB DDR3 SDRAM Memory Module - 16 GB (1 x 16GB) - DDR3-1066/PC3-8500 DDR3 SDRAM - 1066 MHz - 1.50 V - ECC - Registered - 240-pin - DIMM - Lifetime Warranty

IBM® 46C7489 Compatible Factory Original 16GB DDR3-1066MHz Registered ECC Quad Rank x4 1.5V 240-pin RDIMM