Desktop modules that operate at speeds up to 1600 MTs & have a CL11 latency It is dual voltage & can operate at 135V or 15V It is Unbuffered & is non-ECC It conforms to the industry standard UDIMM layout of 240 pins & is compatible with computers that take DDR3 UDIMM 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 & a socket on a larger printed circuit board The pins on the front & back of a DIMM are not connected to each other Each 240-pin DIMM provides a 64-bit data path (72-bit for ECC or registered or Fully Buffered modules) To use DDR3 memory your system motherboard must have 240-pin DIMM slots & a DDR3-enabled chipset This is because a DDR3 SDRAM DIMM will not fit into a standard DDR2 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 & 120 pins on the back for a total of 240 240-pin DIMMs are Approx. 525 inches long & 118 inches high though the heights can vary While 240-pin DDR3 DIMMS 240-pin DDR2 DIMMs 184-pin DDR DIMMs & 168-pin DIMMs are Approx. the same size 240-pin DIMMs & 184-pin DIMMs have only one notch within the row of pins