Welcome to the store! 1、21300 Bandwidth: DDR4 memory type, 21300 bandwidth, 19 19 19 19 43 CL, 1.2V operating voltage, suitable for desktop computers. 2、2666MHz Frequency: Excellent performance with a frequency speed of 2666MHz, backward compatible with lower frequencies (2400MHz and 2133MHz). 3、Improved Responsiveness: 4GB RAM improves system performance by speeding up loading times, improving system responsiveness, and increasing the system's ability to handle larger workloads. 4、Stable Performance: Laptop memory provides stable and excellent performance, compatibility, and stability support for all major platforms and dramatically improved response. 5、Efficient Heat Dissipation Efficiency: Metal housing, superb heat dissipation system, efficient heat dissipation efficiency to ensure stable operation. Item Type: 4GB DDR4 RAM Material: PCB, metal Capacity: 4 GB Memory Type: DDR4 Frequency: 2666MHz Bandwidth: 21300 CL: 19-19-19-43 Operating Voltage: 1.2V Applicable: Desktop PC 1 x 4GB DDR4 RAM Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!