What is a 240-pin DIMM? A 240-pin DIMM (dual inline memory module) is a type of memory module used in desktop computers. It consists of a printed circuit board (usually green) with multiple memory components (usually black) attached to it. The module is inserted into a socket on the motherboard, providing additional memory for the computer to use. How does a 240-pin DIMM work? The gold pins on the bottom of the DIMM provide a connection between the module and the motherboard. The pins on the front and back of the DIMM are not connected to each other. This allows for a 64-bit data path (72-bit for ECC or registered or Fully Buffered modules) to transmit data very quickly. What is DDR2 SDRAM? DDR2 (double data rate 2) SDRAM is a type of memory that is used in 240-pin DIMMs. It is a leading-edge generation of memory with an improved architecture that allows for faster data transmission. DDR2 SDRAM is available in various speeds, including DDR2 PC2-3200, PC2-4200, PC2-5300, and PC2-6400. Compatibility and Installation In order to use DDR2 memory, your system motherboard must have 240-pin DIMM slots and a DDR2-enabled chipset. It is important to note that a DDR2 SDRAM DIMM will not fit into a standard SDRAM DIMM socket or a DDR DIMM socket. Additionally, 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. Specifications and Dimensions A standard 240-pin DIMM is approximately 5.25 inches long and 1.18 inches high, though the heights can vary. The number of black components on a 240-pin DIMM can also vary, but it always has 120 pins on the front and 120 pins on the back, for a total of 240 pins. This type of DIMM is commonly used in desktop computers and is easily recognizable by its 240-pin configuration.
