Boost your system’s performance with the 4GB DDR4 2666 MHz SO-DIMM Memory Module from Crucial. With clock speeds of up to 2666 MHz, this 4GB single ranked memory unit is designed to enable you to load applications faster and run demanding programs with minimal lag. The module is non-ECC and unbuffered, features a CAS latency of 19 and a power rating of 1.2V, and works on systems with a DIMM slot and a DDR4-enabled chip.