The darkFlash U400 Air CPU Cooler Black is a compact single-tower air cooler designed for gaming and everyday desktop PC builds. It features four direct-contact heat pipes for efficient heat transfer, along with a 120mm fan running from 800 to 1800 RPM for balanced cooling performance and low noise operation. The cooler delivers up to 62 CFM airflow, 1.98 mmH2O static pressure, and a rated noise level of 25.6 dBA.

Its black heatsink design is enhanced with ARGB lighting and an infinity mirror top cover, giving modern gaming builds a clean visual style. The tilted tower layout helps avoid memory interference, improving compatibility with RAM modules in compact or mid-range systems. Retail listings also describe the U400 with 4 heat pipes, ARGB lighting, and infinity mirror styling.

The U400 supports modern Intel and AMD platforms, including Intel LGA 115X, 1200, 1700, 18XX and AMD AM5/AM4 sockets. With a 157mm height and slim 65mm depth, it is a practical choice for users who want an affordable ARGB CPU cooler with good compatibility and a stylish look.