The Patriot PSD44G266681HB PS001462-BK DDR4 4GB(1X4GB) 2666MHz is a single 4GB DDR4 SDRAM module designed for improving the performance of computers and laptops. With a total capacity of 4GB and a high speed of 2666MHz, this memory module is ideal for boosting the speed and efficiency of your system. The reputable Patriot brand ensures quality and reliability, making it a dependable choice for upgrading your computer's memory capacity.