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Hmm, I've just discovered the kernel drivers for adjusting processor speed, intended for laptops. However, my desktop machine here at work has a P4 which supports native throttling down to 375MHz anyway (but not the SpeedStep module, which I assume is chipset support for slowing down other bits of the system).

Anyway, I've discovered while fiddling with it that it's the processor producing a lot of background noise in my headphones-- when the processor is running at 1.5GHz, there's a lot of background buzz that practically disappears at 375MHz. It's amazing what you find by fiddling :)

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Steve Haslam

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