4GB 2x2GB Dell OptiPlex 755 Mini Tower RAM Memory DDR2 Could be Samsung, Kingston, Hynix, Smart, Corsair, Elpida, Micron, or Nanya Warranty: LIFETIME WARRANTY WorldWide Shipping to most countries & USA Capacity: 4gb (2x2gb) - You receive 2 Stick of the 2gb LONG DIMMS for a total of 4gb