Well I checked the BIOS and it can't be adjusted. As fare as BIOSes go, this one is pretty limited.
I can't really adjust the load either, it's already just the fraction of a degree that makes it go in overdrive. Cooling looks clean, no dust buildup yet. I am not exactly watching movies or anything either. All I do is type papers and browse the occasional text-based site. No flash apps or anything.
Really, all I need is it to stay at the fixed 'medium' speed noise, slightly above the cool low speed noise. That's not too annoying, you cancel it out after a while. It's all the ups & downs between low and medium RPM that irks people.