TrashBench repurposes a trash 4-kW air conditioner radiator for his test bench to see how well it can cool a PC — achieves a shocking 28C on an Nvidia RTX 3080

Not content with previous cooling experiments, TrashBench has taken PC thermal innovation to new heights by utilizing a discarded 4-kW split air-conditioning radiator. After removing the refrigerant gas and most internal components, he integrated the radiator, fan, and pump into a water-cooling loop for his test bench.

The modified cooling system was tested with an Nvidia RTX 3080, maintaining temperatures at just 28°C—significantly cooler than many conventional cooling solutions. TrashBench added casters for mobility and a standard reservoir to complete the custom setup, demonstrating how discarded technology can find new life in computer hardware.

This unconventional approach highlights the growing trend of DIY PC cooling innovation, where enthusiasts seek increasingly effective methods to manage thermal output from high-performance components. The experiment showcases how everyday objects can be transformed into specialized technical equipment with creative engineering.