Undervolting COre Duo : share your results thread!

What voltages
software used
temperatures
battery life

share it all !!!

 

Since you have a core duo, do you have any results? Have you even managed to do this (I thought it was impossible with the core duo?) I know last time I tried any of the programs my Acer just blue screened continuously, was very hard to get into it long enough to kill the program so I'm not REAL anxious to try again, but if others have had success...

 

If you use a program like RMClock you can undervolt a little. Its lowest voltage is capped at 0.950 volts I believe. So you can't lower the voltage as much as say on the older Dothan series (P-M) which could be lowered down to 0.700 Volts.

 

CoreDuo T2400
0.962v @ 1.83ghz
Full load = 53c
RMClock

 

What about @1000MHz, is it really that hopeless?

Somewhere on linux forum I read about Yonah operating at 0.748V at 1GHz...
It is confusing me.

 

Nice score! Have you tried with NHC?

 

NHC does not work, for some reason. I think its Core Duo support is still hit/miss.

 

whoa.. what did you use to get that?

as far as i know, my dell is running 1.2625v@ 1.83Ghz

 

I use RMClock

 

RogueMonk... did the temperature drop much, or did the battery life increase? If so do you have any numbers for us? I just want to know if it really helps that much with core duo CPU's.

 

My temps dropped about 5-7c. Battery life remians unchanged, because the CPU already defualts down to .950 when on battery. Too bad the Core Duo is locked to .950v.

 

I've been tryin to mod those little voltage out with NHC, still haven't got any success. Voltage for 6X 998Mhz seems locked as Rogue pointed out. And changing 10X 1667mhz in NHC don't work either as it won't take effect in real time clock reading. I am a poor man... and i've got to work on understand how RM works!

 

so, it is locked ...

Does it actually mean that Core Duo notebooks have no chance to be on par in terms of the battery life with the previous generation PMs when the latter are undervolted?

 

so when you were using RM clock, what profile did you have it on. Did you set voltages for each multiplier from 6-11X- if so what were all your values?
thanks
Dan

 

Attached are some screen shots.

 

I have it set to the following:
1000Mhz: 0.950v
1166Mhz: 0.950v
1333Mhz: 0.950v
1500Mhz: 1.000v
1666Mhz: 1.025v

I can feel the temperature difference. My battery life seems to have improved slightly at higher speeds but obviously not at all on lower speeds. I wish it were possible to do true undervolting with Core Duos.

 

this stable for games too like doom3/source?

 

When I play Doom 3 on my Asus Z96, the proccessor never really goes up past 1ghz. That's 6X(Min) multi. And I benchmarked it at 1.83 ghz(T2400) and at 1 ghz, and benchmarks were practically identical. Undervolting doesn't really seem to help unless you are encoding on battery or something and your processor is constantly at its max speed.

I found that temps to drop a fair bit for load temps at 1.83 ghz. From 73C to 65C. BOTH cores were under full load, done via Prime 95. Temps are about 10C lower for each when only 1 core is under load.

Unless your notebook runs really hot when you are running on AC, or you do something that forces the processor to max multi on battery, you won't really gain much from undervolting. That is, unless you could lower voltage below .95. Then I would imagine some real nice undervoltage benefits at min multi.

 

Tool- RMClock

Scanario 1-
Account - web surfing.
Backgroud processes-
Antivirus, Transparency, Dock with big PNG Icons, 3D effects (WinFlip), Yahoo widget engine with 10 widgets (Including a Big Animated Analog Clock)

Foreground tasks- Opera, Yahoo messenger, MSN, Rediff, Skype.

RMClock profile-performance on demand.
All Mulitpliers at 0.95V (the minumum option) 6X~10X
Systmem Rock Solid!
Usually runs at 6X (1ghz)
Core temps- 23.C ~ 33.C

Fan/Noise -Absent.
Graphics temp- ~40.C

Scenario 2-
Plain undervolting

Background tasks- Minimum/Absent
Foreground - Game (NFSMW,DOOM, Call of duty etc)

Multiplier 10X 1.667 Ghz at 0.96 (Just a Notch higher Than Min)
Lower Mulitpliers at 0.95V

Aquamark score - 43K
Temps 50~60.C
Fan at low sppeds
Graphics temp 50~60.C

Before Undervolting-
Multiplier - Switches 10X 1.667Hgz at 1.26V and 1Ghz At 0.95V
Websurfing Temp- 40~58.C
Gaming temp- 80~90.c (Ouch! My pants!)
FAN- Huh! Its better called a Hairdryer!

Config-
1>Custom HP DV 8/9XXX series (Import
from Singapore)

2>17.2 in Widescreen, 1400X900
Dual lamp,Ultra bright (OMG!!!!!
Gorgeous!!!) 5:3 Aspect ratio

3>Intel Core QUAD, 1677Mhz,667
Mhz FSB , 2MB L2 cache, 31W
socket 479

4>Intel 945PM Chipset,Pcie X16
support,Sata Support,Upto 2G RAM
support.

5> 1 GB DDr2 667 mhz RAM.

6>Nvidia GF 7400Go OEM SLI!!!!
- 2X nvidia G72 cores at 400Mhz
each + 512 MB RAM (700Mhz)each
OC'd to 564/864 For gaming Profile

7>Intel HD audio

8> 2X Seagate Momentus 7200Rpm
Sata2 HDDs (80GB X2)

9>HP DVD Writer/RAM with
Lightscribe

10>Inbuilt Bluetooth and Wi Fi, +

Dial-up Modem +100mb/s lan
11>Ports-
4X USB2
1X S-video and VGA
1X Firewire
1X PCM cia and Express card slot
5 iN 1 Card reader


Misc-

1>HP Quick play Buttons
and remote control

2>Copper Heatpipe cooling

3>Fullsize + Numeric keyboard

 

T2370
0.950V at 1.73Ghz
Full load 49ºC
RMClock - 6x to 13x - all set at 0.950V
Don't have a clue about battery life I barely use it

 

Guys, this thread is nearly 2 years old, please do not revive old threads.
You can post you undervolting in the "undervolting" thread.

K-TRON

 

Sorry,
I thought this is the most revalent thread.
Can you link me a better place to post?

 

Here is the link to the undervolting thread,
post there:
http://forum.notebookreview.com/showthread.php?t=235824&page=19

K-TRON

 

ya but that thread is clouded with all kinds of processors plus it is way too long
it would be nice to be more specific to c2d

Penryn T9300 @ 2.5GHz
SuperLFM (DISABLED)
6x 0.9500v
7x 0.9500v
8x 0.9500v
9x 0.9500v
10x 0.9500v
11x 0.9500v
12x 0.9875v
13x IDA (DISABLED)
RMClock used for UV, NHC for battery life and discharge rate

On battery I have disabled 10x through 12x to keep from comp clocking too high.

SuperLFM while able to run at 8x was causing more battery drain than the standard 6x and so I disabled it. IDA was just a hog and that too was turned off.

Temps have dropped about 7C and now I run on average in the mid 30's.
Comp showed minor battery life improvments of about 10min with UV. Biggest improvement came from clock up and clock down regestry tweaks. Those netted around +30min. Now I can get my 6 cell to go for nearly 4hrs while taking notes in class.


Performance loss was detected but it was slight.
wPrime 32M went from 33.046 sec without UV to 34.499 with above UV. This difference of about 1 sec was reproducable over and over again (all this is still with 12x max clock running at 2.499GHz).

 

SuperLFM cant drain more battery. If i turn mine off, my idle will be 2c higher. Your supposed to set it at 6x so it idles at 600mhz. How do you know theres more battery drain?

I just ran wPrime 32M with and without RMclock and got the same figures. I did it about 4 times just to make the tests accurate. I got 37.5xx on every test. There is no way lowering the voltage can affect performance. If you didnt setup RMclock properly or software issue, i can see why

Do you have the multi core patch installed for XP Pro SP2? im beginning to think it might be XP

 

Well that is what NHC shows and in real world I lost about 15min. When it hits superlfm the RMClock wheel in toolbar is full red and I drain more than when at 6x. I will try to set the superlfm to 6x to see if anything changes, but I thought the whole point of SuperLFM is to run lower voltage on higher clock (I can be wrong). Also what difference would superLFM 6x make when compared to regular 6x.

I had the multi core patch installed. The 1 sec difference is there. The second I turn off the UV it goes back to 33.0xx sec (I keep RMClock on entire time to make sure voltage changes are actually occuring). When I turn it back to 12x @ 0.9875 and run the test again it is at 34.5xx sec. 1 sec is probably not a huge deal, but yeah I am stumped as to why UV alone would effect it even when clocks are the same.

 

I can only guess its not throttling properly. I ran it 4 times with and without RMclock on. I ran it an extra 4 times with RMclock ON but changing my profiles to "no management" and "performance on demand' to make sure the voltage settings changed back to stock. I still got the same marginal results..

SuperLFM stands for super low frequency mode. It means you can idle at an even lower voltage and lower frequency. I dont see how it can eat up more battery...