OSX and undervolting

Hi all,
While I have a MacBook on the way, I am a bit concerned with the heat issues. It seems to me that some degree of undervolting can help.
I'm also debating whether I should install OSX/Parallels/Ubuntu or just Ubuntu.
Since I've never used OSX before, I'm curious if there is support for undervolting. Has anybody here managed to undervolt a MB/MBP?

 

The Core Duo and MacBook supports dynamically processor and voltage adjustment. The Core Duo features several power states.

So it already does it automatic but I have not heard of any programs for MacOS X that lets you override the automatic voltage adjustments however.

 

Afaik Yonah processors are not good for undervolting, because Intel has set the lowest voltage to 0.950 vs. the previous lowest voltage of 0.700 for PM Dothan and Banias which is well below the Intel specification 0.950 (so that there was a real chance to have your PM working at the lower power than even Intel's ULV processors specifications!).

You can still undervolt the highest steps of Yonah and I would be interested to know how far one can go. However, it will have a little impact on the heat, unless you are gaming, video decoding and cracking math on your lappy all the time keeping the processor at the highest speedsteps.

Undervolting under Linux is already possible.

Somewhere in the thread it is burried my post with the links to the undervolting under MacOSX. I posted it like half a year ago, but I didn't study details, as I don't own Mac anymore. The link was about the maosx undervolting of the previously used G4 chips.

 

True, but every bit helps. I'm writting and using multithreaded software, so I'm at max speed most of the time. Actually, undervolting the low-frequency settings is not as appealing to me as doing it for the high speed ones.

Yep. Although I have not attempted a dual core yet.

I'll try to find it, thanks.

 

Report back on what you dig up.

I also develop multithreaded programs (simulations) and sometimes (most
of the time) I may have the scale of the simulation dialed back for tests
so I do not need raw speed...but I do need both cores to test for race
conditions, etc.

So undervolting a hot laptop by dialing back the full speed clock is
appropriate for me. Actually, I have 3D visualization too, so I would not mind
GPU underclocking control too, but I could not find that for OS X either.

What I don't want is a weaker/cooler laptop since I do want to crank the speed
back up manually when I want to run full sims (and games ).

Also, I'd like to see more reports on native ubuntu installs. Current breezy
seems to have sata trouble with the MBP, although I did get gentoo to boot.

 

Linux in general has trouble with SATA