240 pin dimmr approximately 525 in by 118 in 13335 mm by 30 mmr 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 printed circuit board the pins on the front and back of a dimm are not connected to each otherr 240 pin dimms are used to provide ddr2 sdram memory for desktop compute