The Noctua NF-A4x20 FLX 40x20mm Premium Quiet case fan in brown is a high-quality and efficient cooling solution for computer cases. With a 40mm diameter and a maximum fan speed of 5000 RPM, this fan provides optimal airflow while operating quietly. The fan is designed with a ball bearing for durability and longevity, and it is compatible with a universal range of brands. Perfect for fitting RAM modules, this fan is a reliable choice for keeping your computer cool and running smoothly.