Crucial 2GB (1GBx2) DDR2-1066 (PC2-8500) Non-ECC 240-pin UDIMM Memory Module - CT2KIT12864AA1067/CT2CP12864AA1067 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