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Simple Undervolting Tutorial - Pentium M Dothan - Page 12

post #221 of 1202
4/21/05 at 4:11am
Sorry to repost again, but did anyone notice after running the laptop for a while, the cpu speed will stay at the highest speed all the time, even if you set it to automatic mangaement.
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post #222 of 1202
4/21/05 at 5:28am
Quote:
Originally Posted by gsfeng
Sorry to repost again, but did anyone notice after running the laptop for a while, the cpu speed will stay at the highest speed all the time, even if you set it to automatic mangaement.
Mine is running at CPUE clock between 1050 and 1596 depend on the CPU & OS load.
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post #223 of 1202
4/21/05 at 10:52am
Quote:
Sorry to repost again, but did anyone notice after running the laptop for a while, the cpu speed will stay at the highest speed all the time, even if you set it to automatic mangaement.
Try enabling run HLT command when idle.
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post #224 of 1202
4/21/05 at 5:11pm
Has anyone really tested out their notebook to see how much extra runtime they're getting from this mod? If so, post your results in here:

http://notebookforums.com/showthread.php?t=77654

I was able to get 4.5hrs on my 700m w/8-cell battery, 1.8G, 5400rpm, FULL screen brightness and wifi on.
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post #225 of 1202
4/21/05 at 5:11pm

BatteryMon

Quote:
Has anyone really tested out their notebook to see how much extra runtime they're getting from this mod? If so, post your results in here
Most people don't have the time/patience to do a battery test. See below for alternative.

Quote:
Originally Posted by sakvaua
Testing battery life is very time consuming.
Yes. A quicker way to test the imapact of undervolting on the battery is to observe the battery discharge rate. BatteryMon (free for 30 days) will show you that:
http://www.passmark.com/ftp/batmon.exe

The lower the better!
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post #226 of 1202
4/21/05 at 5:50pm
Thanks Gonna Try It When I Get My Laptop Yaya
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post #227 of 1202
4/21/05 at 5:57pm
I'm trying this out on my XPS 2. I haven't done the serious multi-hour tests yet, but my preliminary settings are below:

Maximal VID: 1.084
Minimal VID: .732
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post #228 of 1202
4/21/05 at 6:25pm
huh, that's a low maximal for 2.0ghz. I couldn't get mine that low and have it go longer than a few hours in prime before I got a BSOD. Although my minimal is .700 volts, not sure why you couldn't get that.

I'm almost tempted to try again, not sure why my cpu would all of a sudden let it go lower than what I have now, 1.148v, but it is a thought

Tellerve
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post #229 of 1202
4/21/05 at 6:33pm
Quote:
Originally Posted by Tellerve
huh, that's a low maximal for 2.0ghz. I couldn't get mine that low and have it go longer than a few hours in prime before I got a BSOD. Although my minimal is .700 volts, not sure why you couldn't get that.
Well as I said, I haven't run the long Maximal test, so that number isn't firm yet.

I BSODed on .716V, but I'm 45 minutes into a test of .732V. I thought .700V was a given too. The general page said "startup .988V" and "minimal .700V" before I went to the management window, so I though the chip would be able to handle it. I guess not.
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post #230 of 1202
4/21/05 at 8:02pm
yeah, that is strange. I'm not sure which I'd like more but I'm thinking I'd rather shave off some more on the top end of the volts rather than the lower, but maybe not.

The other issue I need to look into is my gpu as it is the real heat producer when playing games.

Good luck with your voltin'

Tellerve
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post #231 of 1202
4/22/05 at 1:20am
I'm running RMclock v1.4. Everything is working as expected, but once in a while it comes up with NO clock management and I have to set it to automatic management manually. Has anyone experienced this? What's causing this?
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post #232 of 1202
4/22/05 at 1:20am
The amount of time you gain can be checked with MobileMeter.

1. Charge your battery up and then run your laptop off your battery.
2. Run MobileMeter.
3. Set RMclock back to the factory settings (max/min voltages back to original settings).
4. Do whatever you normally do on your laptop (or max out the CPU with Prime95 or SuperPI) and keep an eye on the "Discharge Rate".
5. Then, set RMclock to your undervolted settings and resume what you were doing; again looking at the "Discharge Rate" on MobileMeter.

Make sure you do the same "activity" for both voltages (factory and undervolted).

On my i9300, I save 11 watts of power (with the CPU at 100%) by undervolting. Undervolted, my system uses about 35 watts at 100% CPU (not gaming). I have an 80Wh battery. Here's the math:

(Battery capacity in Wh) / (Power used while undervolted) - (Battery capacity in Wh) / (Power used with factory voltage) = Battery Life Gained (in Hours)

In my case:

80/35 - 80/46 = 0.54 hours or about 32 minutes.

Check this post out for a detailed analysis of how much each component of a laptop uses.

http://notebookforums.com/showthread...098#post802098
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post #233 of 1202
4/22/05 at 1:30am
Interesting way to do that Asdasl, thanks. As for RightMark doing weird stuff, today I had downloaded Sisoft and 3dmark05 and was doing testing. I was getting some really low results in Sisoft and then noticed that RightMark had been somehow switched to Minimal settings and so I was locked at 800mhz, as opposed to 2ghz.

Tellerve
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post #234 of 1202
4/22/05 at 1:53am
Thing is, you're testing what the maximum possible savings would be on the battery. It's important that people know that, because they're (Intel) CPUs aren't running @ full throttle all the time. You're only saving power when it does run full throttle.
You might barely notice extended battery life if it was sitting idle the whole time.

I think the program is really great. Just keeping us grounded to reality.
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post #235 of 1202
4/22/05 at 2:14am
Thread Starter 
At idle and the processor clocked at the lowest speed I have noticed a reduction in power consumption of 1300 mW. It's not anything particularly amazing but it's still noticeable to me.
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post #236 of 1202
4/22/05 at 2:36am
Right. The big power savings is when you play games or watch a DVD or do graphics / video editing. Anything CPU intensive.
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post #237 of 1202
4/22/05 at 4:05am
This post rocks I had the fan of my Acer 2026 (2.0 GHz Dothan)always running but after undervolting it now shuts off more often

My results with 10hrs of Prime running are:
Minimal VID : .700
Maximal VID : 1.132

Do I need to run Prime for a longer duration or is it OK?

- Uvig
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post #238 of 1202
4/22/05 at 11:00am
It's amazing. This is such a simple and basic thing to take advantage of, and look at what it saves!

-Are donations to people that write this stuff tax deductable? I mean, it's an upgrade to my business laptop, right?

These guys definitely deserve a present. (Now that I've tooted my horn, I've gotta remember to donate!)
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post #239 of 1202
4/22/05 at 4:00pm
I ran my Min VID for 6 hours without any errors. Then, I tried to test my Max VID, but RM Clock crashed each time I tried it. The thing is, Prime95 continued running without errors during any RM Clock crash. If the voltage was really causing a problem, I would expect Prime95 errors to accompany the RM Clock crashes.

Does the RM Clock crashing mean I need to try a higher maximum or is it just a bug in RM Clock (using v. 1.5)? Or should I try using "Run HLT when idle"?

Any suggestions?
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post #240 of 1202
4/22/05 at 4:27pm
Quote:
Originally Posted by bloke
]but RM Clock crashed each time I tried it.
How did it crash?
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