Fanless CPU Cooler Orientation, Does it Matter?

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Does CPU cooler orientation really matter for passive cooling? That’s a question I thought I had a reasonable answer for, but I’ve never extensively tested it. Let’s start with some of the basics. In a fanless configuration, airflow only occurs because the air is heated by the cooler and becomes less dense. Due to the force of gravity, the less dense heated air naturally flows upward, and is replaced by cooler air from below. CPU coolers work well only when air can easily pass through them, so in a fanless setup the cooler should allow air to flow upward through the cooler and not around the cooler.

For the Phanteks, Raijintek, and Scythe coolers, the orientation did not seem to make a significant difference. For the Arctic Alpine 12, it is clear that the vertical fins are much better, and for the Thermalright Le Grand Macho, it is significantly better in the upward or downward orientation, B or D. Keep an eye on this channel if you found this video interesting. I am currently testing a few of these coolers in two more orientations, with the case and motherboard lying flat, and the coolers sitting upward or downward from the motherboard socket.

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