Total Micro 4GB DDR2 SDRAM Memory Module - 4 GB - DDR2-800/PC2-6400 DDR2 SDRAM - 800 MHz - Non-ECC - Unbuffered - 200-pin - SoDIMM - Lifetime Warranty Enables efficient and smooth execution of all your heavy-duty applications with maximum productivity 800 MHz of memory speed makes your computer great at multitasking SoDIMM 4 GB of memory to refine your computer's performance 200-pin-pin DDR2 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computer's performance 200-pin pins for optimal performance and maximum reliability SoDIMM form factor with 200-pin pins and 4 GB memory size effectively lessens the electrical load on the memory controller to allow maximum feasibility Unbuffered signal processing for dependable programmability of the processor for easy optimization of digital signals