Cooler Master R4-C2R-20AC-GP SickleFlow 120mm Silent Fan

The Cooler Master SickleFlow 120mm (R4-C2R-20AC-GP) is a case fan engineered to balance high airflow with low noise output. Spinning at 2000 RPM, it pushes up to 90 CFM of air while generating only 19 dBA of noise—a combination that makes it well suited for users building quiet PCs without sacrificing cooling performance. The optimized sickle-shaped fan blades are designed to move a large volume of air efficiently, making this fan effective for case intake, exhaust, or mounting on CPU cooler heatsinks.

Built around a long-life sleeve bearing rated for 50,000 hours of operation, the SickleFlow 120mm offers respectable longevity for its price range. It connects via a standard 3-pin header and ships with a 3-to-4-pin adapter, ensuring compatibility with virtually any motherboard. At just 4.2W of power draw, it adds negligible load to your power supply. The standard 120mm x 25mm dimensions mean it fits in any standard 120mm fan mount, whether in a case, on a tower cooler, or on a radiator. For builders looking for a straightforward, affordable cooling solution that keeps noise to a minimum, the SickleFlow 120mm delivers on its core promise.