IBM Compatible 8GB PC3-12800 DDR3-1600 2Rx8 1.5v ECC UDIMM (IBM PN# 00D4959) Compatible With IBM Part Number: 00D4959 8GB PC3-12800 DDR3-1600 2Rx8 1.5v ECC UDIMM For IBM Servers only. Not compatible with IBM laptops and home computers. Lifetime Warranty Third Party; 100% Compatible