The Celsius series is all about delivering the best possible cooling with the least possible noise. Radiator fittings use Standard g 1/4" Thread for maximum compatibility and expandability with standard DIY componentseasily add and integrate a GPU block of your choice to eliminate noisy graphics card fans so the only sound you hear is the sound of your gamean intelligent Temperature-controlled auto mode adjusts fan and pump speeds in real-time for optimum balance of cooling performance and silence. An integrated fan hub with concealed cable routing simplifies cable management for a clean installationthermal paste is pre-applied and has high thermal conductivityincluded Fractal Design dynamic x2 PWM fans offer a wide speed adjustment range from 500 to 2000 RPM allowing for near silent operation under lighter loads and maximum airflow during heavy usage. only individual components of the Fractal Design Celsius S24 or S36 are covered).