Very heavy blades. The device itself is heavy, but so are the blades. It seems they could be aluminum, but they aren't. It takes a while for them to fully boot up, but mine eventually hit 1735 RPM in both my BIOS and fan manager. Completely shut down neither in the BIOS nor the motherboard software. I felt the slightest vibration when holding it in my hand, but it was completely absorbed by the rubber inserts when you installed or installed it. It makes almost no noise at full trot and still cools my 140mm radiator.
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