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by oso2k 3200 days ago
It's the physics of the volume of air that is being moved by the fan. A 2U tall fan has to spin twice as fast to move the same volume of air as a 4U tall fan. A 4U is roughly the same dimensions as a full height desktop or workstation. They probably employ lots of 2U servers.
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All of our servers are full towers, not rackmount, and still sound like jet turbines.