Crucial 8gb ddr3 pc3 12800 registered ecc 135v 1024meg x 72 ddr3 240 pin dimm approximately 525 in by 118 in 13335 mm by 30 mm 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