Crucial 2GB PC2 8500 240 pin DIMM DDR2 Unbuffered PC Memory

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 other. 240 pin DIMMs are used to provide DDR2 SDRAM memory for desktop computers. DDR2 is a leading edge generation of memory with an improved architecture that allows it to transmit data very fast. Each 240 pin DIMM provides a 64 bit data path 72 bit for ECC or registered or Fully Buffered modules. The Ballistix™ and Ballistix Tracer™ high performance memory do not come in 72 bit or registered modules. Standard DDR2 240 pin DIMMs are available in DDR2 PC2 3200 SDRAM, DDR2 PC2 4200 SDRAM, DDR2 PC2 5300 SDRAM, and PC2 6400 SDRAM. To use DDR2 memory, your system motherboard must have 240 pin DIMM slots and a DDR2 enabled chipset. A DDR2 SDRAM DIMM will not fit into a standard SDRAM DIMM socket or a DDR DIMM socket. The number of black components on a 240 pin DIMM can vary, but it always has 120 pins on the front and 120 pins on the back, for a total of 240. 240 pin DIMMs are approximately 5.25 inches long and 1.18 inches high, though the heights can vary. While 240 pin DDR2 DIMMs, 184 pin DDR DIMMs, and 168 pin DIMMs are approximately the same size, 240 pin DIMMs and 184 pin DIMMs have only one notch within the row of pins. The notch in a 240 pin DDR2 DIMM is closer toward the center of the module.