So i have been using smcFanControl app for a while now. The stock speed is 2,000 rpm and i run mine at 3,000 rpm when on battery and 3,500 rpm when plugged in. I just ordered thermal paste & i am going to re-do it on my Mac since its running hot and and i have never replace it yet. so to stay on topic, there is stuff all over the forums. Speeding up your fans is bad, or its good, it they will die in a few years, etc. Is there any solid proof that its really bad for them? To my real question... does speeding up your fans truly speed the computer up or does it just keep it cooler. I remember back in my "building desktop days", the colder the comp is the faster it runs. Does the fan speed and the mac running colder have any true effect on making it faster??