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I had a problem with the fan on my ASI533MC-PRO late last year. Suddenly my star images made it look like the mount was ever so slightly circling the stars during an exposure. I was at a loss as to what could have been causing it at the time, until I wondered if the fan had a bad bearing. I put my hand on the camera and took a shot - it was perfect.
I ended up grabbing a Noctua NF-A4x10 FLX to replace the fan in my camera. It came with silicone mounts which I also used (instead of the stock screws). It's as good as silent and absolutely vibration free. The mounts keep the fan somewhat isolated from the frame of the camera which also helps.
For $30 I thought that it was money well spent.
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