My MB C2D fan has a tendency to make a whine at certain rpms. Around 2640 it kicks in, sort of a high pitched "singing" or hum that goes away as the fan either spins up or slows down. Sounds like it is oscillating with something. The next threshold is around 3100 RPM and the last that Ive noticed - and worst in terms of loudness - is at 3678-3680. It really hums here.
The C2D MB is pretty silent as it is, so the slight whine stands out a lot, even if it is very silent. In a mentally annoying way that is, the noise is not totally driving you up the wall like the CPU/screen whine reported from the MBPs. I've heard that and THAT is horrible. But when I sit working in my silent room, with just the sound of the macbook harddrive and my old wind up clock, this hum gets a bit on my nerves. I can move the fan control slider and it makes the noise go away, untill the automatic sensor next time decides to park the fan speed at Annoying Oscillation Threshold.
Im still undecided about whether Im obsessing or just should leave it. I mean my old laptop makes a din compared to this and Ive worked on that for years. I have right of return so I got to make my mind up. Is it normal for the MB fans to "hum" at certain speeds? Is it a dodgy fan or something that can be fixed? I probably won't bother swapping it since I love the computer a lot, but I have to this friday to make up my mind.
Has anyone noticed a similar experienc with their own MB?
Damn, why do you fall in love with Mac OS X and the MB so fast? ^_^
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