Compatible Memory (RAM) Replacement for Samsung M378B5173QH0-YK0 ^^ 4GB Module ( 1 x 4GB ) ^^ DDR3/DDR3L 1600 MHz ( PC3L-12800 / PC3L-12800U ) ^^ DDR3L DIMM ( 240-Pin ) ^^ Non-ECC UDIMM ( Unbuffered DIMM ) ^^ 1Rx8 - Single Rank x8 ^^ 1.35V - DDR3 Low Voltage (Can operate at 1.35V or 1.5V ) ^^ Maximizes the performance of your system by speeding up loading times, boosting responsiveness, and improving the ability to support greater workloads ^^ All modules undergo quality assurance testing to ensure dependable and reliable performance ^^ A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase