4GB DDR3 MEMORY EXPANSIONLexmark 4GB DDR3 SDRAM Memory Module 4 GB DDR3 SDRAM VPN: 57X0204 SKU: 303522NDN UPC: 734646649049 4 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance DDR3 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate DDR3 SDRAM interface multiplexes 2 bit data from memory cell and I O buses to minimize processor idle time and enhance your computer's