8GB ( 1x 8GB Module ) DDR3 1066 MHz ( PC3-8500 ) DDR3 DIMM ( 240-Pin ) ECC RDIMM ( Registered DIMM ) 1.35V - DDR3 Low Voltage Compatible Equivalent for IBM-Lenovo 49Y1381, 47J0138, 49Y1399, 49Y1417, 46C7482 High performance Memory RAM upgrade designed for Server/Workstation Systems All modules undergo quality assurance testing to ensure dependable and reliable performance Please verify the supported memory (RAM) specifications of your system prior to purchase to ensure compatibility A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase