Passive is for PWM monitored fans. It won't allow the fan to spin up beyond your default BIOS speed.. Basically it saves a bit of power, but then you should set your processor to something like maximum of 50% when under battery power. On a notebook this may also prevent your fans from spinning up beyond it's default normal speed or only enabling one of two or three fans depending on how it's setup in your laptop BIOS for the minimal fan settings.
I've used it, and when my desktop did go to the battery the fan was still spinning. I do have an aftermarket heatsink but it doesn't use PWM, so with PWM you might want to test it out and make sure. I didn't notice any adverse affect, but even if my CPU heatsink did stop, I do have enough airflow that I would be ok anyways for a while. On my laptop it only enables my fans, but they won'y go into hyper drive like they normally do. Again I also reduced the maximum CPU usage to 50% just to be on the safe side. It's just another way to stretch out battery life.
If your BIOS allows case and CPU fan speed settings, that's still the best way to go. Say if something should happen and Windows loses control, at least your BIOS settings will always work and most modern motherboards allow fine tuning of system fans, or at least the CPU fan.
P.S. What model of X2 do yuo have? You might want to adjust your maximum processor state accordingly. If it's a faster model 50% id fine, if it's a slower model maybe 65%, just so it has enough oomph to save your things and shut down without taking forever.
Multi-Core Upgrade Guide
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05:19 PM by