Centon 4GB DDR2 SDRAM Memory Module - 4GB (2 x 2GB) - 667MHz DDR2-667/PC2-5300 - DDR2 SDRAM - 200-pin SoDIMM Enables efficient and smooth execution of all your heavy-duty applications with maximum productivity Up to 667 MHz speed is enough to run heavy software smoothly while surfing web with dozens of tabs open 4 GB memory allows you to have more programs open at a time 200-pin-pin DDR2-667/PC2-5300 interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computer's performance 2 x 2GB modules for quick access and retrieval of data and information to ensure maximum usability 200-pin for faster, dependable performance and better access to data and information SoDIMM form factor with 200-pin and 4 GB memory size effectively lessens the electrical load on the memory controller to allow maximum feasibility