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The 8GB Kit (2 x 4GB) 240-Pin DIMM DDR3 PC3-12800 Memory Module from Crucial is DDR3 memory for desktop computers with an improved architecture that allows quick transmission of data. 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 and a DDR3-enabled chipset. This is because a DDR3 SDRAM DIMM will not fit into a standard DDR2 DIMM socket or DDR DIMM socket.
Note: Crucial Ballistix and Ballistix Tracer high-performance memory do not come in 72-bit or registered modules