4GB DDR3-1333 SODIMM TOSHIBA # PA3918U-1M4GAxiom Memory Axiom 4GB DDR3 1333 SODIMM for Toshiba PA3918U 1M4G For Notebook 4 GB DDR3 1333 PC3 10660 DDR3 SDRAM 1333 MHz 204 pin SoDIMM Lifetime Warranty VPN: PA3918U 1M4G AX SKU: RSC652811 UPC: 845282063899 4 GB memory allows you to have more programs open at a time 4 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance Up to 1333 MHz memory speed to manage your routine softwares with pace