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The 8GB DDR3L Memory Module from Panasonic has been designed for select Panasonic Toughbooks, including the CF-19 MK7, CF-19 MK8, CF-31 MK3, CF-31 MK4, CF-31 MK5, CF-53 MK3, CF-53 MK4, and CF-54. This memory module provides an additional 8GB of memory in a 1 x 8 GB configuration with a clock speed of PC3-12800 (1600 MHz). Adding more memory to your Toughbook will help boost its capabilities, including improving system performance and application responsiveness. Start-up times will be improved with fewer delays during routine operations, and more programs will be able to run simultaneously with easier switching between them.