How to Choose the Right Radiator Size for Your Build

Radiator surface area is the single biggest factor in how quiet and cool your custom loop will run. Undersizing forces high fan speeds; oversizing wastes case space and budget.

Start from total heat load

Add the TDP of every water-cooled component. A modern CPU and GPU can easily push 700W under load, which is the real number your radiators need to dissipate.

Radiator area rules of thumb

A common baseline is 120mm of radiator per 100–150W of heat for quiet operation. Denser radiators need higher static pressure fans, while thin radiators run well on low RPM airflow.

Balance layout, airflow, and noise

Two 360mm radiators are often better than one thick 480mm in tight cases. Push-pull, ambient temperature, and fan curves matter as much as raw radiator size.

Key Takeaways

Total system TDP drives radiator sizing
120mm per 100–150W is a quiet baseline
Layout and fan choice matter as much as size

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