The Crucial CT25664AA1067 is a 2GB DDR2 RAM module with a PC2-8600 (DDR2-1066) bus speed. It is designed in a DIMM form factor and operates at 1066 MHz. This memory module is ideal for upgrading or replacing existing RAM modules in computers that support DDR2 SDRAM memory technology. With its reliable brand reputation and high capacity, the Crucial CT25664AA1067 is a smart choice for enhancing the performance and efficiency of your computer system.