On Mon, 9 Feb 2009 19:28:40 +0100 Jochen Kunz <jkunz%unixag-kl.fh-kl.de@localhost> wrote: > On Mon, 9 Feb 2009 17:58:58 +0000 > raymond.meyer%rambler.ru@localhost wrote: > > > I did replace the fan about a year ago, it didn't make much > > difference. The noise is due to the speed at which the fan rotates > Fan != Fan. There are several levels of quality. There are fans of the same > form factor, but some provide a high air-flow and thus rotate faster. Faster > rotation, more noise. There's also the fan blade design as a factor, and bearing type. Last time I looked into the issue, bearing type from loudest to quietest went from sleeve (over a year old), single-ball, double-ball, fluid, sleeve (under a year old). I think there's an additional type available now. I've dealt with the same issue (fan noise in an U10 and a Blade 100), and replaced both case fan and PSU fan with fluid-bearing fans with as close to the same CFM as I could get, with the lowest dB/CFM I could find at the time. IIRC, I lost about 3 CFM overall, which is workable with where I have the machines set up, and total noise output is now ~20dB. YMMV. [...] > > I wouldn't buy a cheap PSU. There are many good quality modern PSU on > > the market. Just because something is modern doesn't mean it's crap. > I still have to see a PeeCee PSU that is not cheap crap. And I doubt that > there are big differences in efficiency from the original PSU to an off the > shelf PeeCee PSU. Isn't PSU capacity also a factor in overall efficiency? The U10 PSU peaks at 200W output.... -- T. M. Pederson <tmp+nbpsu%disfinite.org@localhost> GPG key fingerprint = FFAF D056 F12B E03F 7084 1288 EF8B E1FE 1693 21EB +Accept: text/plain; charset=ISO-8859-*,UTF-* | "Oh dear God, I hope I'm joking"
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