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Yes, tapping the feedback signal sounds like a great, easy, safe idea; I'll try that. But before I start, does anybody know offhand which is the feedback wire - red, black, or yellow?

I think I'll have to drop the resistor/diode idea; it will reduce speed but also affect feedback which will make the BIOS complain. I'll get hold of an oscilloscope to find out exactly what the feedback signal looks like and see if I can make a little circuit to produce the same output. Thanks...

felixc: A resistor - great idea! I'll try various values and see what happens. itsmoked: It's a standard HP Proliant; there are two sockets for each fan position, to allow for redundancy and hot-plugging.

That's 90x90x38 of course. I wish I could use other options, but there's the pernickety BIOS to overcome first.

OK, thanks for all those contributions. I suppose the only solution is to look for quieter fans, but at 90x38 mm, they might not be easy to find.

I have a server computer which contains three cooling fans. The fans' speed is controlled by firmware, but even the lowest speed is very loud, even though all the internal components are always very cool to the touch. So, I want to find some way to reduce the noise level. When I removed one of...