Axiom 4GB DDR3-1066 SODIMM for Toshiba - PA3677U-1M4G (PC3 8500) PA3677U-1M4G-AX Powerful performance - DDR3 nearly doubles the speed of DDR2 by offering faster data rates Low Power Consumption - DDR3 operates on a reduced supply voltage thanks to its efficient design. Higher Bandwidth and Density - DDR3 allows better computer performance thanks to the fastest data transfer rates available.