4GB DDR4 2666 Laptop RAM Increase bandwidth by up to 30% Reduce power consumption by up to 40% and extend battery life. Samsung 4GB DDR4 2666 Laptop RAM faster burst access speeds for improved sequential data throughput Optimized for next generation processors and platforms Available in modules up to 8GB and kits up to 32GB. Samsung 4GB DDR4 2666 Laptop RAM Voltage 1.2V DIMM Type Unbuffered Component for Laptop PC`s Samsung DDR4 DIMMs Product Highlights Speeds start at 2133 MT/s .