Simple Undervolting Tutorial - Pentium M Dothan - Page 38

Originally Posted by Dozzit

ah ha, you guys are overclockin' or pin-moddin'... but there's still no way i'd expect temps that high... i mean the whole idea of SpeedStep is NOT havin' the pedal to the metal all the time, just wastin' cycles/electricty... those are closer to what i'd expect to see from P4...

Originally Posted by rage4order

I think when I recheck the AS, I'm just gonna remove the pin mod......for now .

Originally Posted by Mr. K6

Why on earth my good man

Originally Posted by Mr. K6

Ahhh, nice then, go for it; just don't do away with 2.26GHz

Originally Posted by Mr. K6

hmm... I think there needs to be a a few things updated for 1.6v, here goes:

First off, go to the general tab and select whatever functions you want on the bottom, but make sure that you select "restore CPU defaults on exit" in case something messes up, then you can just exit . Then, under the management tab, select use p-state transition. In the white box right below that there should be two (you'll probably have to create at least one). The first should be State No. 0, with an FID of 5x (or whatever your lowest is) and a voltage of 0.998v (or w/e it is stock on your lap top). This is the 800MHz power saving setting for the new P-Ms. The other should be State No. 1, with your max FID (mine is 15x) and your stock full voltage (mine is 1.356v).
Make sure that your A/C adaptor is plugged in, then go down to AC profile and select "maximal" from the drop down box. Get Prime 95 started and calculating (Large FFTs work best for a test). Also make sure that you select "Use OS-based load management" (same as run HLT etc.). From here go back to your P state transitions box and click on the max setting (the one with your highest multiplier) and modify the voltage going to it. I took it down 3 steps at a time until I got to about 1.15 and then I went down one at a time from there. Make sure you hit apply on the bottom of the management tab after each voltage change. You can also use CPU-z to vertify the voltage change. If you're pin-modded you may need to stop sooner because your CPU will require more juice. Keep lowering it until you get an error, then raise it and prime test. Anything higher than 8 hours means you're rock solid. I got an instant error at 1.054, but I run 1.1v just for the extra stability (10hrs+ stable).
Once that has been tested, go back to the management tab and under AC profile select "minimal". This will use your 800MHz CPU (or whatever your lowest multi is) setting. The odd case here is that now you will load at this speed, which will never happen in "real-world," the CPU is only at 800MHz when it's idle. In the same way drop your voltage down (remember to hit apply). I think almost every CPU can do .75v, and most can do .700v, but test and test again. After that let prime95 run for 3 hours or so, which is more than enough because the CPU will never be loaded at this state.
Ta-da, you're done. Just make sure you go to management and select "Automatic Management" under your AC Profile. Also under you General tab select "state minimized" and "run automatically at start up," but make sure you keep "restore defaults upon exit" just in case something ever glitches on your. Have fun and rock on

Originally Posted by Mr. K6

garbaeg - those voltages are the exact same ones I use, but why do you have the extra 6x setting? I'd get rid of it. Also, 51-55C is great if your fans are turned off (some notebooks do this when the CPU can stay cool enough without them), however if they're still on then that is kind of high, check your settings.

Originally Posted by garbaeg

My fans are off, I don't really know why I put the extra 6 there. I removed the 0.988 only 6x 0.700 there now. I just started it up after being off for awhile and it's running between 40-45c now. If I keep it in my lap it usually gets pretty hot but on a solid surface that preferably doesn't cover the fan it seems to keep pretty low with just www, msn etc.

Thanks.

Originally Posted by Mr. K6

garbaeg - those voltages are the exact same ones I use, but why do you have the extra 6x setting? I'd get rid of it. Also, 51-55C is great if your fans are turned off (some notebooks do this when the CPU can stay cool enough without them), however if they're still on then that is kind of high, check your settings.

Hellfirex- Is speedswitcher a program that works with speedstep? If it is then it's unecessary as RMClock does everything. Yes you have to have RMClock run at set up. If it isn't running, the CPU will run at normal voltage. Both AC and batter must be set to automatic for RMClock to work properly. Here's the update I wrote for 1.6v, it might help with any other questions. Good luck man

P.S.- What happened to Tar_Heel_Guy, he used to be a regular in this thread...

Originally Posted by b0ogieman

Hey,

I have a Vaio A497XP which I tried undervolting with these numbers:
6x 0.700v
12x 1.020v
15x 1.084v

It's a Pentium M 760 Sonoma CPU and I use CHC for this task, but whenever I set these voltages after a while I get a bluescreen and the laptop reboots. Anyone have an idea why? Shouldn't these numbers be okay?
Also, does the CPU take any damage by setting incorrect voltage?

Originally Posted by rage4order

You need to raise your volts a bit. I bet if you ran Prime95, you'd be getting all kinds of errors. The blue screen just means your voltages are a bit too low.