Kingston Technology 1 GB DIMM Memory 266 MHz (PC 2100) 184-Pin DDR SDRAM Single (Not a kit) KTD4400/1G Includes one 1GB module of 266MHz DDR Desktop Memory for Dell Replaces Dell 311-2364, fits in dimension 2400,4500s,4590t, optiplex gx260, gx60, L60, SX260, and whitebox 510d systems Memory designed, manufactured and tested to the specifications of each particular brand name computer system From the industry leader in PC memory 184-pin DIMM type