Welcome to the store! 1. 21300 Bandwidth: DDR4 memory type, 21300 bandwidth, 19 19 19 43 CL, 1.2V operating voltage, suitable for desktop computers. 2. 2666 MHz Frequency: Excellent performance with a frequency speed of 2666 MHz, backward compatible with lower frequencies (2400 MHz and 2133 MHz). 3. Enhanced Response Time: 4GB RAM improves system performance by speeding up loading times, enhancing system response time, 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 time. 5. Efficient Heat Dissipation Efficiency: Metal casing, excellent heat dissipation system, efficient heat dissipation efficiency to ensure stable operation. Item Type: 4GB DDR4 RAM Material: PCB, Metal Capacity: 4GB 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 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!