4GB (4x1GB) Memory RAM for HP Compaq dc5100 Series DDR2 PC2-5300 (667MHz) (MAJOR BRANDS) Could be Samsung, Kingston, Hynix, Smart, Corsair, Elpida, Micron, or Nanya Warranty: LIFETIME WARRANTY Will Ship WorldWide from United States 4 of the 1gb ddr2 5300 Long dimm