I was wondering whether it is possible to manually control the CPU voltage of a CPU with PowerNow. I know there are some PowerNow programs out there, but they use the default voltage settings which are really not optimal. For example, my CPU (XP-M 2800+) can run very stabily (never had a CPU-related crash) at 1.4GHz with 1.075v on Windows, even though the default voltage is 1.3v (or something close to that).

Basically I want to manually control both the CPU frequency (which I know how to do) and the CPU voltage (which I don't).

Thanks.

Try this: http://gentoo-wiki.com/HOWTO_PowerNow!

That site doesn't really give information on how to use PowerNow! in linux besides monitoring it (or so it seems to me). Also, there is almost no mention of voltage (which is the crucial thing). PowerNow works somewhat on my system atm via powersaved, but the problem is it's not user controllable. Whatever goes on (I'm not sure that it even does automatic voltage scaling) is completely inaccessible to the user.

But anyway, someone I know actually pointed to a kernel mod, also on the Gentoo forums, which I'm currently trying to port into Debian... it's not hard so I don't think there will really be problems, so I guess we could consider this problem solved until something else pops up (hopefully not).