Crucial 4GB DDR3 1600 MT/s (PC3-12800) CL11 Unbuffered ECC UDIMM 240pin 1.35V/1.5V (4 Gb 9 chip). Crucial 240-pin DIMMs are used in DDR3 memory for desktop computers. DDR3 is the latest generation of memory with an enhanced 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 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). (The Ballistix™ & Ballistix Tracer™ high-performance memory do not come in 72-bit or registered modules.) Standard DDR3 240-pin DIMMs are currently available in PC3-8500 (DDR3 1066 M Hz) & PC3-10600 (DDR3 1333 M Hz) speeds. Additional speeds will be added as the technology becomes available. 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.