Crucial 240 pin DIMMs are used in DDR3 memory for desktop computers. DDR3 is the latest generation of memory with an enhanced 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 & a socket on a larger printed circuit board. The pins on the front & back of a DIMM are not connected to each other.