Does the fan on Macbooks with Nvidia Geforce graphic cards run less often?

I have a Macbook Core Du0 1.83ghz running 10.6.3. Each time I watch a video on youtube or watching Flash or other multimedia animations, my fan run super fast.
Is it the same with the new Macbook with the Nvidia Geforce graphic card?
Does the fan on Macbooks with Nvidia Geforce graphic cards run less often?

Watching videos taxes the GPU and CPU. That's why the fan runs faster - to cool the computer. When you aren't doing much the fan slows down. This is true of all the laptops regardless of which GPU is involved.
Since you have the first generation MB model, it runs hotter than later models that incorporated some changes to the cooling system making the fan run faster during idle. You can accomplish a similar result using the third-party fan control software, SMCFanControl - VersionTracker or MacUpdate. It can be used to increase the fan's idle speed to 2000 RPM. This won't make the fan run any slower when the computer heats up.

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