Simple Undervolting Tutorial - Pentium M Dothan - Page 7

Does anyone know what the difference between using P-state transitions (PST and On-Demand Clock Modulation (ODCM)? My Pentium-M supports both. Which is more efficient? Right now I'm using P-State transitions. Both of them will change the cpu frequency but which is better?

P-state as it allows for voltage changes and gives you more control over frequency.

Does anyone else have problems undervolting where your computer freezes while you're on Step #8?

You can undervolt just about any CPU (AMD, Intel, Motorola, Samsung, etc). Most people with desktops want to overclock the CPU (make the CPU faster than what its rated for). Overclocking usually requires you overvolt your CPU. Of course, the amount of juice you use on a desktop doesn't matter because you are plugged into the wall.

With a laptop (using a battery), undervolting saves power. No performance changes what-so-ever. By using less power, it also runs cooler. Cooler CPU ----> Slower / no fans -----> Less power used / quieter laptop -----> Happier user!

The reason why CPU companies don't undervolt their chips to begin with is that not all chips can be undervolted to the same level, but ALL can run at the original level. In my case (Pentium M 1.6GHz; Inspiron 9300), my CPU originally was running at 1.356v (max; 1.6GHz) and 0.988v (min; 800MHz). I have mine down to 0.908v (max; 1.6GHz) and 0.700v (min; 800MHz). That's 33% less voltage (and power)! I dropped over 30F. I also reduced my power (this is while the CPU is running at 100%) by 11 watts! This is just by undervolting the CPU. No performance change, no cracking the case open.

The reason you need RightMark is because you can't set the voltage levels in the BIOS (like you can with most desktops). So, you need the software to change it for you when your computer starts up.

MobileMeter is also a GREAT utility to see how much power you save by undervolting. SuperPI is a great program to max your CPU out at 100%. FanGUI to manage fans.

Great post needledik, bring more...

Great post needledik, bring more...

Hi, i also would like to hear from someone who done this experiment w/ a 700m.
And what are the times you got w/ a 4 cell and 8 cell?
Right now i have both, but the 4 cell is uselles for me because i need it for school and 2:30 average won't do for me.

I posted my results already, but I'd like to add something to put things into perspective. Earlier today I was playing the free trial of EQ2 (that damned game is going to seal my life I fear... my money too) when I realized my laptop felt really hot. At first I thought it was because I was wearing shorts for the first time since I'd gotten it, but then the fan kicked into high gear (I have fangui set to do this IF the cpu hits 150*) that was when I remembered that I had closed rightmark earlier to see the temp difference. After restarting right mark, temps dropped to 102* in less than 15 seconds. That is just amazing thanks again to everybody who provided this information!

Hey Keshino have you found a fix for this? Im having the same problems. The Maxiaml VID keeps on jumping back to the original value. Help.

Sorry about the stupid question, but how do you get the Prime 95 to show if you decrease too much the numbers in the other program?
Thanks!!

If Prime 95 reports an error, it means you decreased too much already.

I am on "Always On".
Minimum VID at 0.700v and max at 1.196v.
The CPU throthling between 600 to 2000MHz depend on the load.

So far so stable.
I am editing image using Photoshop CS, running 4 - 7 Firefox windows, Microsoft Outlook 2003, CPUZ (to monitor the clock behave), Acrobat Reader 7 (reading manual of Uniwill).

If no problem, then I will lowered the voltage again.

Actually I have done this several weeks ago before I read this post. Found the head-up on x1000's forum.

But effort and time consuming writing done by needledik is very much I appreciated.

cangguek

Picard, do you mean the Max VID on the General tab, or the Max VID dropdown menu on the Management tab? If the dropdown menu stays set, then you are good to go - don't worry about the other reading.
My Max VID reading on the General tab just stays at the max for the chip (1.308) - regardless of what I set on the Management tab (1.004). But the chip never goes over 1.004.

Hey do you guys use fangui with rmclock? Coz when my rm clock is running, fangui shows that my cpu load is 100% (constant and no changes).

Can someone post a decent link to MobileMeter? I am having trouble finding a suitable download site.

thanks

Try checking the "Use alternate CPU load method" (or somthing like that) on one of the tabs (one of the last 2 I think). I wish I could be more specific, but I'm at work and don't have access to fangui.

I posted this on page 8:
Picard, did you work out the Max VID readings?

Yes, What I actually did is to work on the Minimal VID first then the Maximal VID just worked. My Minimal is 0.700V and maximal is 0.972V. But I only tested each for 30 mins. Do I really have to torture-test each settings for HOURS?

Another quick question, what will happed it i did not test the setting enough and continue to use these settings and an error occurs? Will this result in a BSOD?

got any sites that aren't in chinese?