Crucial 48gb 16gbx3 ddr3 1866 rdimm memory kit crucial 240 pin dimms are used in ddr3 memory for desktop computers ddr3 is the latest generation of memory with an improved architecture that allows it to transmit data more quickly a dual inline memory module dimm consists of a number of memory components usually black that are attached to a printed circuit board usually green the gold pins on the bottom of the dimm provide a connection between the module and a socket on a larger prin