Undervolting thread : Post your settings

Please post your undevolting settings here.

I'm still running stress tests, I'll post when I'm done.

 

I have T7200 & T7300 both stable at 1.05V at 2GHz. They might work at one or two notches lower but they crash at 1.0V. I used to have a T5600 which was stable at 1.025V.

John

 

Turion X2 TL-50 1.6GHz

Stock 1.075V @ 8x , 0.800V @ 4x

Now 0.925V @ 8x , 0.800V @ 4x

Turion 64 ML-30 @ 1.6GHz

Stock 1.375V @ 8x

Now 1.150v @ 8x

 

My T7200

At 2 Ghz undervolted can run at 1.05V no problem - to be safe i run at 1.06V
Every other multiplyer runs safely and happly on .0925V 1~11

thanks for the tread

 

Intel Pentium M 750 1.87 GHz (Lowest NHC reported stable voltages)
6.0x - 0.988V
8.0x - 1.052V
9.0x - 1.084V
10.0x - 1.116V
11.0x - 1.164V
12.0x - 1.196V
13.0x - 1.228V
14.0x - 1.260V

Turion 64 ML-30 1.6 GHz
4.0x - 0.875V
8.0x - 1.050V

 

These are kinda high compared to the average, Its dothan right ? Usually people can go to .700 -.750v for 6x

 

INTEl C2D T5200

Stock: 1.175V
Now: 0.950V (lowest possible setting)

See Image

 

im new to undervolting. where can i find a guide that tells me how much i can safely undervolt a t7300? and how to use NHC?

 

A mega thread on pentium M undervolting - same priciples apply to core duos.
http://www.notebookforums.com/thread70943.html
It uses RM clock, I think NHC has a simpler interface.

Chaz has written a brief intro NHC here:
http://forum.notebookreview.com/showthread.php?t=60914

An undervolting core duo thread:
http://forum.notebookreview.com/showthread.php?t=111818

 

Same for me as well...

 

Intel Pentium M 730 1.6 GHz
6.0x - 0.700V
8.0x - 0.748V
9.0x - 0.812V
10.0x - 0.860V
11.0x - 0.892V
12.0x - 0.972V

 

AMD Turion64 X2 TL-50
4x @ 800MHz - 0.8v, Stock 0.8V
8X @1600MHz - 0.95V, Stock 1.075V.

 

Hmm... I'm wondering... is it possible to undervolt a graphics card? Because they run very hot as well. If yes, would you recommend it and how do you do it?

 

Yes it is...but the drivers will do all that for you. ATI and NVIDIA cards do underclocking and undervolting automatically when there is no 3D needed or laptop is unplugged.
Some modded drivers do not work like this so you must consider that before installing them.
For underclocking you can manipulate manually that using ATITool, NTune, RivaTuner and others...those won't let you undervolt though.

 

Oh.. so those drivers at laptopvideo2go don't feature automatic undervolting? If they do, how would I know before I download one?

 

dear god that IS low...the lowest i could get my t7200 is to 1.05!! how did you get it that low without crashing..i can see from your image that youre bench testing. is it fine so far?

 

I thought the lowest multiplier was locked, maybe I must have gotten it confused with Core 2 Duo's being locked at 6x and thinking the Pentium M's are locked at the lowest too.

So I guess I will undervolt further, but I just have a question. If I use NHC to undervolt and the voltage is too low and causes my computer to crash/restart, will the voltages set by the program be reset just like in RMClock where nothing is saved once it crashes and I can go back into Windows and choose a different voltage?

 

Yes core duos and C2Ds are locked, P-M's can undervolted everywhere.

Thats a good question. I assume its the same behavior.


I had a stable voltage of .7v at 6x for my 2Ghz dothan, unfortunately lowest stable at 20x seems to be 1.212, just 0.128 lower than the stock 1.34. Less than 10% reduction.
At 1.212, cpu 100% utilisation cpu temp is 64 C
At 6x, 0.7v, it was around 38C
I'll be using 20x for system updates, so if 1.212 turns out to be stable for prime95(another 10 hrs to go), I'll bump it up to 1.244 (two steps above 1.212)
I really dont want my system crashing during a sys update.
EDIT: I'll bump it up only during a sys upgrade, as I'll have to change power scheme to 20x anyway.

As I'm being conservative at 20x, I dont want to do a simple interpolation at intermediate values.
I'll agressively test the lowest stable voltage at 8x, and 18x, then do a linear interpolation.

 

Actually I've been running at this voltage for almost half a year, no problems yet
Max temp droped from 80+ to under 60

 

NICE
What kind of cpu temps do you get when idle ? Which frequency does 6x correspond to ?

 

Usually I don't find it necessary to do the full stability test. On my Turion once I hit a voltage too low, automatically restarted. I increase it to the next highest voltage afterwards and Prime95 ran stable, I did the test for 20 seconds. After that I just kept the setting and its been stable since.

 

Is RM Clock and Prime 95 compatible with Vista 64-bit?

 

PM 725 Dothan 1.6Ghz

6x 0.700V
8x 0.812V
10x 0.908V
12x 1.004V
14x 1.100V
16x 1.212V

I have been using these for over a year now... stable. Should i go lower?

 

About 39C when the fan is on(light load like internet). When its idling, the fan turns off at 37C, and turns back on at around 50C.

800Mhz at 6x.

 

I find it necessary to run prime95.
A couple of times I passed the NHC stability test, even the one for 15 mins, then I ran prime95, and it gave an error within a second.

Do you want to ?

 

Pentium M 1.86GHz - it's been running stable at these settings for over a year:
6X: 0.780
8X: 0.860
9X: 0.908
10X: 0.940
11X: 0.988
12X: 1.036
13X: 1.084
14X 1.100

The cooling guide details how to do this as mentioned one one of the first two pages of this thread.

 

On my Girlfriends P M Banias 1.4 Ghz
the voltages i use are
6X------.7v
8V------.812V
10X-----.876V
12X-----.972V
14X-----1.084V

This fixed her nc4000 heat and battery problem =)

 

Intel Pentium M 750 1.87 GHz (Dothan)
6.0x - 0.716V
8.0x - 0.764V
9.0x - 0.796V
10.0x - 0.844V
11.0x - 0.892V
12.0x - 0.924V
13.0x - 0.972V
14.0x - 1.020V

I was able to go lower than those settings, but RMClock crashed after a few seconds, yet in NHC it ran fine using the quick test. But since I prefer to use RMClock I decided to increase voltages up to the next value, and its running fine.

 

Yeah, NHC self test is not all that good, I've had NHC run fine (even the 15 min tests, yet firefox or prime95 would imeediately give errors.

chinmonkie, those are some fantastic voltages for a banias. Typically banias requires higher voltages than dothan

My dothan 2Ghz seems to be stable at
6x: 0.700v (max temp 38 C)
18x: 1.116 v (max temp 55C)
20x: 1.212 v (max temp 64)

I'll do another stress test at 8x, then do a linear interpolation

 

Despite having my Pentium M running at Max Battery @ 0.716V my CPU temperature is only 46C-50C. I was hoping for around 40C, my Turion using Max Battery @ 0.875V was able to bring the temperature to 42C. Even having the Fan Always Enabled didn't help much for the Pentium. I'm guessing its probably cause of the GPU.

 

Perhaps also subpar application of thermal grease may be contributing to it.

 

Thanks i ran prime 95 for 7 hours just to make sure it was real =)

 

Great settings, those are a few notches lower than mine on each multiplier. I am going to try reducing the voltages further later.

 

Well this laptop is about 3 years old, reconditioned and been sitting at Acer for who knows how long. It seems that I cannot get to the CPU without disassembling the entire laptop, which I am not willing to do, so I guess I'll have to live with it. I have noticed however that beneath the touchpad is where the wireless card is located and I think that is the cause of the heat on the touchpad. The left side exhaust isn't a bother.

 

I have that same problem in my thinkpad T42

 

My settings for Pentium M 2Ghz Dothan 755:

6x: 0.700v
8x: 0.732v
10x: 0.796v
12x: 0.876v
14x; 0.956v
16x: 1.036v
18x: 1.116v
20x: 1.212v

All voltages were tested individually with prime 95. Nothing was interpolated
Note that 10x->18x was linear (0.08v for 2x increment), and 6x->10x was not.
Also note that I was able to undervolt by 0.288v at 6x, and only by 0.128 at 20x.
CPU temp was 37-40C at 6x, and 60-64C at 20X (thinkpad T42)


Dothan 755 has a TP of 21 w. Does this mean it consumes 21w at 20x, 1.34v ?
Also, does this then mean it only consumes (0.7/1.34)^2 * 21 = 8w at 6x, 0.700v ? I've assumed a V^2/R relationship for power, which is not going to be true, but perhaps as an approximation ?

 

1. Yes, the TDP should be the worst case power consumed / heat created.

2. I believe that V^2/R broadly applies, although I think there may also be a frequency factor. One way you can check is to monitor the power drain when running on battery. You can see the power drain (= charge / discharge rate) on RMClock's battery tab (although it seems to be quite slow in updating) or, if you have XP and would like a graph, use MobileMeter.

John

 

Sweeett, so it would use less than 10W at 6x ?

 

That shouldn't be too difficult. 10W for the CPU and 5W for everything else (if integrated graphics) is plausible.

The best tuned of the current generation of notebooks are down around 10W power drain for the whole notebook (see Luke Alexander and his Samsung Q45) but this results from the CPU spending a lot of time in a low power sleep state.

John

 

Pentium M Banias 1.7Ghz

6x: 0.748
8x: 0.828
10x: 0.924
12x: 1.020
14x: 1.116
17x: 1.276

Tested with prime95, for at least 12 hrs (concurrently also ran windows media player.
At lower voltages, sometimes laptop would freeze, or reboot itself.

 

Dothan Pentium M 725 1.6 pinmodded to 2.13Ghz, my settings for the last year or so...

6x: 0.700
8x: 0.764
10x: 0.892
12x: 1.036
14x: 1.116
16x: 1.180

Same 725 chip but just upped the OC to 2.4Ghz today so these setting can and will be improved...

6x: 0.940
8x: 1.036
10x: 1.116
12x: 1.196
14x: 1.260
16x: 1.308

 

What mobo do you have???? I have PM 725 also...I wanna pinmodd as well

 

I did seem to have a stable mild undervolt on my M100 (LV Pentium-M 1.2GHz) but now the stability check insists it is no longer stable so I have set it back to defaults.

 

what are the disadvantages that come with undervolting a processor?

 

Once you get your system stable, there is absolutely no drawback to undervolting a processor

 

strange... you'd have thought Intel/AMD would have done this already then before they are sold?

 

Well, unfortunately not every chip made is going to be able to run at a lowest voltage and/or highest frequency. So, they would have to choose an optimum setting to maximise the yield.

 

Not all chips are the same, there always exist some variations. Chip manufacturers take a safe upperbound.
Also depends on the usage, if you are running the chip in really hot weather, or in a laptop with a no so efficient cooling system, you might require higher voltages.

Undervolting is to determine voltages that suffice for YOUR chip, in YOUR laptop, under YOUR operating circumstances.

 

Well,these are my settings:
6X: 0.780
8X: 0.860
9X: 0.908
10X: 0.940
11X: 0.988
12X: 1.036
13X: 1.084
14X: 1.100
it's been running stable at these settings for about a year,however i didn´t see any major improvement in terms of heat ,47C on idle with or without NHC,(sometimes in order to get cooler temps. I have to stop NHC running)
I've noticed that I can only keep volt setting while NHC is on. Every time I turn my computer voltage changes back to default level so in order to keep my settings NHC must be enabled on startup. How can I keep my volt settings without turning NHC on??

 

Intel T5300 on Dell E 1505
6-13X @ 0.950V
Standard 6x multi = 0.950V
13x multi = 1.175V
The undervolt drops about 10-12C off my operating temperstures.

K-TRON