Simple Undervolting Tutorial - Pentium M Dothan - Page 18

This thread is officially awesome

Finally starting to try this out on my Z71V. This topic hasn't been bumped in a while, and it deserves it.

Undervolting is a piece of cake with Centrino Hardware Control.

Any possibly of someone making an FAQ who knows how to do this stuff as well as consolidating all the questions here with answers?? Pretty plzz???!!!!

problems with undervolting uniwill 223ii0

Hi,

Thanks for this very useful thread!


My configuration: 12" uniwill 223ii0 (aka sentia alienware, winbook x etc)
PM 755 2GHz/2x512MB/80GB/WinXP Pro

I tried to follow the instructions in the first post here and have encountered several
problems.

1. rmclock and mobilemeter show the clock frequency at 2,2 GHz
2. all programs I tried including mobilemeter and SpeedFan show the processor temperature constant at 11.0°C (the same also in Ubuntu linux). The HDD temperature is shown between 51 and 54°C.
3. when I run prime95 "torture test" the processor load is at the level of 50%, not 100%.
Another torture test program CPUBurn-in v1.01 allows to have 100% processor load but then the processor clock oscillates between 2.0 and 2.2 GHz.

SO far I undervolted my 2GHz processor from
max VID 20.0x 1.34V, min VID 6.0x 0.988V
to max VID 20.0x 1.10V, min VID 6.0x 0.7V
prime95 runs stable for 10 hours now but the processor load is only 50%.
If I start to run CPUBurn-in (which needs 100% load) together with prime95,
then prime95 generates mistakes while CPUBurn-in runs without mistakes.
If I chose the next lower level max VID 20.0 x 1.084V, the system crushes after several minutes of operation.

Can I assume that 1.10 V is my optimal choice for max VID?
Is the result good? So far I haven't checked its impacs on fun noise and battery life.

How the problem with the temperature readout could be solved?

Is there any other way to manipulate the fun speed, even manually, both from WinXP and
Linux (Ubuntu, Debian, SUSE, Scientific Linux are my preferences).

new version of centrino hardware control is out 1.8.2

http://www.pbus-167.com/chc.htm

Latest CHC 1.8.2 news and fixes:
- Version 1.8 of CHC read a wrong ATI clock on some newer ATI cards.
- CHC 1.8 and 1.81 have problems on standby resuming if ATI Clock Control is enabled.
- The System Power-on Time in CHC 1.8 and 1.81 is wrong.
CHC Version 1.8.2 fixes all these problems.

I am also interested in the answer. Haven't read the whole thread after page 21 to see if the answer is there.

What about the GPU?

Does the processor temp control the fans for cooling the processor and the GPU. If it does, wouldn't it be bad to use this app?

OK, someone on another forum has helped me. It was due to the BIOS default setup to the "extra performance" which makes FSB to be 110MHz instead of 100.
Going back to the normal performance option reduces the processor clock to the expected 2.0 GHz.

In RM CLOCK, if i've set the AC profile on Automatic Managemet will Intel's SpeedStep still function properly?

Similarly, if my Battery Profile is on Minimal, I'm assuming my processor will never go beyond 600mhz (I have a 1.7 Banias).

Correct?

correct

Tellerve & others - if your DEFAULT MIN is .700, does setting the RMClock MIN to .700 cause any DVD playback/encoding problems?

Thx.

If your processor's voltage is too low for the clock setting, it will crash. Pretty much that simple.

I'm using centrino hardware control for this, and it is working great so far. My computer runs cooler, and still need to test battery life.

Hmm, well I don't encode anything, at least haven't yet. As far as dvd playback, I don't have any problems playing back dvds or copied dvds. I did have a problem once with my girlfriend's dvd disc of a episode of 'office' she got from the office. She was supposed to watch it and the thing for some reason hung up at around 2/3rds of the way through the episode. That's the only mess up that I can remember.

Tellerve

I managed to crash my system at 0.716v. When I plugged a new device in, it caused a spike in the CPU voltage, and it cause a BSOD. Putting it at a higher v made it stable (see my sig for my specs).

YuriSEAL - let me restate my question - if the DEFAULT min. clock is .700, that's OBVIOUSLY not too low; will I cause any stability problems if I leave the RMClock min. clock as .700?
Pretty much that simple.

Tellerve & Mitchell0 - thx for the input

Using what is says here ( http://www.pbus-167.com/chc_guid.htm#anchor_cpu_voltage ) I set mine to 0.812v because of this variation he refers to. Mine is running stable now after changing it.