Product Detail 240-pin DIMMs are used to provide DDR2 SDRAM memory for desktop computers To use DDR2 memory, your system motherboard must have 240-pin DIMM slots and a DDR2-enabled chipset . The "Crucial CT2KIT12864AA800 2GB 1GBx2 240-pin DIMM DDR2 PC2-6400 Memory Module" is best product for you. We recommended Crucial CT2KIT12864AA800 2GB 1GBx2 240-pin DIMM DDR2 PC2-6400 Memory Module