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Simple Undervolting Tutorial - Pentium M Dothan - Page 31

post #601 of 1202
8/4/05 at 1:06pm
I'm sure that the ULV chips are just screen Dothan cores that run well at lower voltages. Just like AMD's mobile Athlon chips are just screened desktop chips that run at lower voltages.

Martian
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post #602 of 1202
8/4/05 at 5:09pm
Well after undervolting I don't see whats so special about the ULV chips. I am at 0.988v on my 15x multiplier (yep, the same as the default voltage for the 6x multiplier!!).
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post #603 of 1202
8/4/05 at 7:10pm
What Intel specifies is far beyond the actually requirements of the processor. That's why we can undervolt our Dothans . I would almost bet that that ULV chip could do lower voltage than yours at that speed (stably, of course).

Sorry knowledge, that was a bad case of me not reading my post before I click "submit" . That comment about the process was directed at strictly_biz. However, as far the voltage jumping to 1.340, I wouldn't be surprised if the BIOS acts before CHC does, explaining the slight gap of normal spec voltage. Tar_Heel_Guy will probably have more info on this.

I'm glad my update helped you guys
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post #604 of 1202
8/5/05 at 2:02am
no harm no foul mr. k6. thanks for your help
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post #605 of 1202
8/5/05 at 1:17pm
Ok, so I finished the udnervolting for the max @ 1.084 for PM dothan 1.6. Now, I just finished the minimal, 6.0x@.700V. Problem: the cpu monitoring is stuck @ 100%, but the clock is throttled down to 599mz. Is thee a problem, or is this normal?
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post #606 of 1202
8/5/05 at 2:48pm
@mpatli3n: I think you have to replace "minimal" to "automatic" now.
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post #607 of 1202
8/5/05 at 6:52pm
I have Sony S460 and I got Max: 0.956 volt and Min: 0.700

Is it normal?
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post #608 of 1202
8/6/05 at 1:11pm
For a max voltage, that's pretty damn low, but it all depends on what processor you have; more info on your specs would help . However, if its stable through hours of prime testing, then awesome for you, you have one cool running laptop
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post #609 of 1202
8/6/05 at 2:02pm
I own S460, 1.73 M processor, 6200 Go nvidia graphic card, 80 gb hard, 512 mb memory, etc and it's not running that cool..

around 46 C ~ 49 C

My desktop gets around 30 C ~ 36C
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post #610 of 1202
8/6/05 at 6:44pm
That's pretty low for a 1.73, gj man. Are those 46-49C temps at load? If they are, taht isn't that bad. Are the ambients the same when you read from both systems? In this heat (32C or so) my load temps climb up to 46-47C too, but that's way down from the 58C+ that I used to get at stock volts. Also note that I did apply AS5 to my CPU.
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post #611 of 1202
8/6/05 at 7:05pm
Quote:
Originally Posted by alsj411
I own S460, 1.73 M processor, 6200 Go nvidia graphic card, 80 gb hard, 512 mb memory, etc and it's not running that cool..

around 46 C ~ 49 C

My desktop gets around 30 C ~ 36C
Your desktop probably also has a large heatsink and significantly higher air flow. The more relevant comparison is how much wattage is your laptop using versus your desktop.
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post #612 of 1202
8/6/05 at 8:09pm
I undervolted my Pentium-M 730. Results:

6x - 0.700V
12X - 0.908V

Are these good results? If i reduce the V, Prime95 complaints.

CPU Temps dropped from 67 to 40 Celsius. @100% CPU usage.

I have a Wattage meter which gave the next results:
Power Usage dropped from 45W to 28W for the complete laptop. The fan spinns a lot harder when on high Voltage. This uses also some W.

The difference is 17W. That should be correct considering that the Pentium-M runs at 26A(Ampere) @1600Mhz. Info

1.356Vx26A=35.256W
0.908Vx26A=23.608W

A difference of 11.648W. The remaining 5W is heavy fan usage and room for measurement error
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post #613 of 1202
8/6/05 at 8:27pm
I am currently testing my 15x multiplier at 0.972v.
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post #614 of 1202
8/7/05 at 12:09am
Wow, excellent hard data Attix, I'll try to see what I can come up with for mine (providing I have a meter somewhere ). However, what worries me is that you said if you drop it any lower, prime95 complains. Are you saying that if you drop is down to .972 you get an instant error or an error after an hour or so? An instant error would mean that it is still not 100% stable at .988, and that you should raise it some
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post #615 of 1202
8/7/05 at 4:22am
Someone help me undervolt using CHC! D:

I'm trying to set the x6 multiplier voltage, but how do I set the laptop to run at 800mhz continously so I can use Prime95 to check for stability?

In fact, how do I keep the laptop (z70v) running at the multiplier speed so I can test it for stability using CHC?
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post #616 of 1202
8/7/05 at 5:31am


Do that, and it will stay on 800Mhz.
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post #617 of 1202
8/7/05 at 8:20am
At 0.908V Prime95 runs perfectly. No errors. When I decrease the V to 0.892V, Prime95 gives an instant error. So 0.908V is the minimal V for my CPU.

Quote:
Originally Posted by Mr. K6
Wow, excellent hard data Attix, I'll try to see what I can come up with for mine (providing I have a meter somewhere ). However, what worries me is that you said if you drop it any lower, prime95 complains. Are you saying that if you drop is down to .972 you get an instant error or an error after an hour or so? An instant error would mean that it is still not 100% stable at .988, and that you should raise it some
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post #618 of 1202
8/7/05 at 9:16am
Thats amazing that you can get that low!!! That is lower that the ULV processors!
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post #619 of 1202
8/7/05 at 12:26pm
Quote:
Originally Posted by AttiX
At 0.908V Prime95 runs perfectly. No errors. When I decrease the V to 0.892V, Prime95 gives an instant error. So 0.908V is the minimal V for my CPU.
But for how many hours does it run perfectly? I just ask because the last thing you want is a crash in an important program

For reference, I instant error at 1.052, but run it at 1.084 daily.
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post #620 of 1202
8/7/05 at 1:24pm
To MitchellO:Or you could just tell it "Max Battery," which will also lock it on 800 MHz.
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