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how many rpm's do you keep yours on? whats the highest safe speed.

The longer it runs at a higher speed, the shorter your fan life is. SMCFanControl is not a toy.

I use it on occasion when I have my MBP in my lap and it gets too hot for comfort because it's working on something; I might crank it up to 4000RPM until the temperature goes down, but within an hour I turn it back down.

Note that fan speeds are different across the generations -- my Core Duo's default is 1000 RPM, whereas the Core 2 Duo non-unibodies default is 2000 RPM and won't go any lower than that. :)
 
The longer it runs at a higher speed, the shorter your fan life is. SMCFanControl is not a toy.

I use it on occasion when I have my MBP in my lap and it gets too hot for comfort because it's working on something; I might crank it up to 4000RPM until the temperature goes down, but within an hour I turn it back down.

Note that fan speeds are different across the generations -- my Core Duo's default is 1000 RPM, whereas the Core 2 Duo non-unibodies default is 2000 RPM and won't go any lower than that. :)

I know.
Is it safe to keep it at 3000rpm for normal use(Internet, Tweetie, iTunes, iChat) & 4000rpm for Heavy use?
 
I know.
Is it safe to keep it at 3000rpm for normal use(Internet, Tweetie, iTunes, iChat) & 4000rpm for Heavy use?

I do use 3000 RPM while the machine is charging or when im using it on my lap, to keep it cool.

Running for hrs on 5500rpm while gaming / video editing / handbrake etc haven't damaged mine so far :p
 
Both (!) of my fans ended up dying about two years into owing my MBP, so I think you're better off getting some product that goes between your lap and the machine...
 
I keep it on 2500 min for battery powered, but when plugged in I have mine always hovering around 5000ish minimum to keep things nice and cool.

Is this unadviseable?

I'm hovering around 45 celsius on battery right now and 76 plugged in.
 
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