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Undervolting your Pentium M

post #1 of 13
4/12/05 at 9:31pm
Thread Starter 
I just want to let you guys know how undervolting improved my overall system temps and battery performance.

BEFORE Undervolting:

Battery: [9-cell] 3:45 hours 100% to forced shutdown (Wireless/bluetooth ON, LCD @ 50%, regular surfing;Peripherals, keyboard, wireless mouse, priner)

Temps: 30-45 with automatic switching fans via fangui.

Power Consumption: 18-22 Watts.

AFTER Undervolting:

Battery: [9-cell] 4:30 hours 100% to 90% (Wireless ON/bluetooth OFF, LCD @ 50%, regular surfing;Peripgerals, keyboard, wireless mouse, priner)

Temps: 30-38 with fans on automatic but NEVER turned on.

Power Consumption: 12-17 Watts.

These are my RMClock settings: Notice: I just torture tested these settings for 30 mins each so I still need to do further and LONGER testings.

Minimal VID: 0.700V
Maximal VID: 0.972W

Undervolting your Pentium M does NOT improve nor degrade overall system performance in terms of speed but will dramatically improve battery performance and system temperatures.

Source: http://notebookforums.com/showthread...ight=undervolt

I will post updates soon. battery is a 9-cell SMP-PA. I am currently testing my 9-cell SONY. All tests whether done in the same system as I used (i6000d) WILL vary in results.
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post #2 of 13
4/12/05 at 9:46pm
Cool, depends on the chip you get. THe voltages used are usually there to ensure stability, if you can undervolt + Prime95 stable, then your all good (and a good chip there)
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post #3 of 13
4/12/05 at 10:30pm
How did you check real-time power consumption?
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post #4 of 13
4/12/05 at 11:18pm
Thread Starter 
Quote:
Originally Posted by STi Sev
How did you check real-time power consumption?
I used Mobilemeter 2.0 and Batterymon 2.0 @ http://www.download.com/BatteryMon/3...ml?tag=lst-0-1
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post #5 of 13
4/12/05 at 11:24pm
i wonder 2.0 533fsb vs 1.5 400fsb with everything else 100% the same (including vcore), how the batt life would be affected

or if i oc 1.5 400fsb to 2.0 533fsb, could i still undervolt and be stable would be nice
sorry to threadjack
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post #6 of 13
4/12/05 at 11:35pm
Thread Starter 
You can't overclock and undervolt at the same time. Overclocking involves actually INCREASING the voltage. Undervolting is unlikely to damage your hardware with correct guidelines. Overclocking is more likely to damage your hardware even with correct guidelines.
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post #7 of 13
4/12/05 at 11:37pm
Quote:
Originally Posted by Picard
You can't overclock and undervolt at the same time. Overclocking involves actually INCREASING the voltage. Undervolting is unlikely to damage your hardware with correct guidelines. Overclocking is more likely to damage your hardware even with correct guidelines.
overclocking != overvolting.

how are you undervolting? by pinmod?
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post #8 of 13
4/12/05 at 11:59pm
Thread Starter 
Undervolting by software. You may read the "Source" on the first posts if you need basis.
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post #9 of 13
4/13/05 at 3:14am
Overclocking + Undervolting is possible, if you have a really good chip. You won't get much more than 50 mhz overclock w/ a similar undervolt though.

Most overclocking involve increasing your Vcore to insure stability.
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post #10 of 13
4/13/05 at 6:47pm
Overclocking by BUS Speed =/= Overvolting

I have my CPU overclocked AND undervolted. I overclocked my CPU by increasing the BUS Speed, not increasing the VOLTAGE.

It is possible, and with this, battery life is still the same EVEN WITH the increased speed.

1.6 ghz -> 1.77 ghz
400 mhz fsb -> 441 mhz fsb
upto 5.5 hrs -> upto 7.5 hrs (single battery, no fans, low brightness, no optical drive, no detection of optical drive, hdd turns off every 5 minutes, etc)

>> All results may vary, results are based on a 8600 with all battery saving capabilities enabled. results are the max recieved by me, some results / opinions do not apply to others, please don't come and ask me hwo to get that much battery life off a single battery, thank you.
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post #11 of 13
4/13/05 at 6:51pm
Quote:
Originally Posted by Kakarot
Overclocking by BUS Speed =/= Overvolting

I have my CPU overclocked AND undervolted. I overclocked my CPU by increasing the BUS Speed, not increasing the VOLTAGE.

It is possible, and with this, battery life is still the same EVEN WITH the increased speed.

1.6 ghz -> 1.77 ghz
400 mhz fsb -> 441 mhz fsb
upto 5.5 hrs -> upto 7.5 hrs (single battery, no fans, low brightness, no optical drive, no detection of optical drive, hdd turns off every 5 minutes, etc)

>> All results may vary, results are based on a 8600 with all battery saving capabilities enabled. results are the max recieved by me, some results / opinions do not apply to others, please don't come and ask me hwo to get that much battery life off a single battery, thank you.
thank you for backing me up.
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post #12 of 13
4/13/05 at 8:17pm
Hi!! Has anyone done it to their 700m??

Thanks!!!
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post #13 of 13
4/13/05 at 8:27pm
Quote:
Originally Posted by fabiodovalle
Hi!! Has anyone done it to their 700m??

Thanks!!!
I have! My max is 1.020V and min is 0.700V. The 4-cell battery now lasts close to 3 hours.
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