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Modder uses a trash 4-kW air conditioner radiator for his test bench to see how well it can cool a PC

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Modder uses a trash 4-kW air conditioner radiator for his test bench to see how well it can cool a PC

Just like we suspected, our fellow Australian hardware examiner TrashBench is up to shenanigans again. Not too long ago, after putting a graphics card in the "wrong" place for much better cooling results, he's ... thinking bigger, let's put it that way. He took an old 4-kW outdoor radiator-fan unit from a split air-conditioning setup (sans gas) and hooked it up to a water-cooling loop to assess its performance.

He kicked off the video with his best impression of Crocodile Dundee, and set out to rearrange the unit for the task at hand, as he only needed the actual radiator, fan, and pump. Most of the fiddly guts were taken out, and casters were added for convenience. TrashBench then added a bog-standard reservoir to the main enclosure.

Moving on to the PC side, he converted a T-joint into a Y-joint with judicious application of heat and force, and, being the ever-clever craftsman, designed 3D-printed mounting brackets for the various cold plates. It was around this time that it was made certain he'd be successful, as at 02:49 you can see that his knuckles paid the requisite blood toll to the machine god.

After firing up the entire system, he set to benchmarking, enlisting both a modern RTX 5060 and a hotter, earlier RTX 3080 for the process. The 5060 is a very power-efficient GPU, and its temperature with the standard cooler was a tame 52ºC. However, the mighty power of four kilowatts' worth of cooling brought that down to just 33ºC, around the temperature of lukewarm water, and a 16ºC drop altogether.


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