Product Detail To use fully buffered DIMMs, your server or motherboard must use FBDIMM architecture. An FBDIMM will not fit into a standard DDR2 socket, and a DDR2 module will not fit into an FBDIMM socket. Each 240-pin DIMM provides a 72-bit for ECC or registered or fully buffered modules . The "Crucial CT2KIT12872AF667 2GB 1GBx2 240-pin DIMM DDR2 PC2-5300 Memory Module" is best product for you. We recommended Crucial CT2KIT12872AF667 2GB 1GBx2 240-pin DIMM DDR2 PC2-5300 Memory Module