The "Undervolting" Guide

I've read through about half of the posts in this thread and it seems many of you are using an Intel Core family processor or something fairly recent.

Is it possible to undervolt a 7 year old 2.4ghz Xeon Pentium 4? RM Clock doesn't give me all the available parameters shown in the OP. Some Google searching hasn't turned over much either. Aside from the obvious benefits, I wanted to get used to RM Clock so I can undervolt a new Dell arriving soon.

 

Welcome to notebook review
Intel Pentium 4's do not support undervolting.
The first Intel processor to support undervolting was the Pentium M
After the Pentium M/Athlon 64 era just about every new cpu support undervolting.

K-TRON

 

I was just wondering something based on this quote:

What exactly defines "2 steps"? If each step is 0.15 volts, would that mean just jumping up by 0.30?

 

Use task scheduler, as follows:

http://www.amindlost.co.uk/?p=276

Now, if you want to run the application at startup, it’s no good using the old method of copying the shortcut to the ‘Startup’ program group because Vista will block any application trying to start with elevated privileges at startup and you can’t argue with the logic of doing so. Instead, you can create a scheduled task to run it at log on. The procedure is as follows:

Click the Start orb and type “Task Scheduler” and press Enter.
In the ‘Actions’ panel, click ‘Create Task’.
Name the task and check the ‘Run with highest privileges’ box near the bottom.
Click the ‘Triggers’ tab and then ‘New’ to create a new trigger.
In the drop-down list at the top, select ‘At log on’.
Choose the option for ‘Specific user or group’.
Click the ‘Actions’ tab and then ‘New’ to create a new action.
Type or browse to the location of the application you want to run.
Your application should now start at log-on with the required elevated privileges.

____________

I use this to run RMClock, HWmonitor (with HMMonitor tray app), and a few others that UAC will get angry with you about. Use task scheduler as above and you will have no problems.

Just make sure you DO NOT click 'run at startup' in RMClock as you will then get a 2nd blocked attempt to run the program that you will get a warning message on. The Task Scheduler can handle the start up for you, so leave that box unchecked.

 

Try Startup manager on download.com or Build-in Startup manager in glary utilities. They never promt me to confirm.

 

Alright then, thank you.
This forum is pretty addictive, so much great info.

 

Overclock.net is down... anywhere else I can get ORTHOS cpu loader?

 

sigh, my CPU is locked at 1.050 and it's already @ 1.050 at all cores.

yeah, i tried CPUgenie. it works so far. before I do anything it was 1.050v@x6 and [email protected]

apparently I think my QX9300 is VID locked @ 1.050v for all multipler.

 

bump......

 

Hi,

I had already undervolted my t7700 (2,4ghz) before formatting. Yesterday i formatted and to day i wanted to download rm clock and put in the same values i had before formatting. But here's the thing: my default values are now much lower than the ones i got when undervolting the first time, at every multiplier.
For example, my 12x, the highest, i got down to 1,200 and now it's at 1,0875.
Other thing that's wierd: under the "cpu info", under maximal req.vcore (VID) it says 1.2500. I don't know if it already did before formatting though.
Anu clues? Can I reundervolt?

 

I am a bit confused at this point. I have a Gateway FX P7805u. I've run all the preliminary tests, but when I undervolted to 8x at 0.9250V, nothing bad happens. That is the lowest voltage that I can undervolt my highest multiplier. Did I do something wrong, or is this acceptable? According to RMClock, I've undervolted the CPU by 0.1875 volts... with no problems or BSOD.
I've included a screenshot to help.

*edit: I am currently on 1hour and 5 minutes with no problems.

 

Is it possible to undervolt the GPU?

 

Nothing bad "has" to happen. You may just have a very good CPU. I've been running my T6400 at 0.9250v on all multis with no errors whatsoever since two nights ago. MUCh lower temps, no issues...I'm a happy camper!

I did notice that RMClock seems to stop working if my laptop suspends. When it came back up a bit earlier RMClock was turned off. Normal? Or maybe I need to look at my scheduler settings.

 

Yes but its only recommended for advanced/expert users because it requires flashing the video BIOS. The relatively small so i wouldnt really recommend it.

I agree

d.rivera: Yes its fine if you dont get errors even on the lowest voltage, it just means you have a good cpu.

I run my older notebook 24/7 on .700v (absolute lowest for a Pent-M) , all it does is download and upload stuff. Rock stable, Zero fan usage, all passive cooling.

Of course you can

1.087v sounds about right for your CPU. If its stable at that voltage then its all good, just do thorough testing.

Maximal req.vcore is the maximum voltage your CPU will allow. It will always be set at 1.250v , same goes for minimal.

 

well i managed to get my QX9300 to be @ 1.050v for all multipliers without crashing with prime95 [email protected]

 

This is weird: when i keep my mouse over the rm clock symbol in the lower right corner of my screen, it says at 12x VID 1.2500 for performance on demand but in profile section for performance on demand, when i open rm clock it says 1.0875. huh?

 

I wanted to undervolt my T9300...
I dont really need it, its almost always under 30C, but i figured, why not let it get lowwer, and get some more battery life, right?

So, when do you think there will be an update for RMClock to recognize half multipliers?

 

Umm, is it possible to have same voltage for every index on the rmclock profile page(stock)? Or is rmclock reading wrong? Cpu's a P9600

 

Before or after you undervolt? I would say its quite possible. After undervolting, all of my voltages are at .9250V.

 

No, it's at stock (before undervolting).. They all show 1.0875v

 

deleted.
Forgot to check Mobile - had Desktop

 

I noticed something interesting over the weekend. For whatever reason, when all multis are allowed, when my system uses 8X it reverts back to 'stock' voltage. All other multis use the forced .9250v without a problem. Intesetingly, when 'forced' to use 8X only for testing, it will use the .9250v setting without issue, only when it is allowed to use its own stepping will the voltage revert when using 8X (profile is set to use .925V at 8X).

Not really an issue since most of the time 8X only appears for a few moments as it is stepping about between 6X and 10X. More of a interesting side note.

 

Its probably cause 8x SuperLFM didnt get detected by RMclock, meaning it will use default voltages.

 

I have a Gateway P7801u with a T9900. I spent a whole day finding the lowest stable voltages for the performance on demand profile.

SLFM 0.9000V (Can't go lower than 0.9000V)
6x 0.9000V
7x 0.9000V
8x 0.9000V
9x 0.9125V
10x 0.9625V
11x 1.0250V

Default voltage for 11x was 1.250 I think.. I also now have it set to Power Saving mode on startup (Locked on 6x SLFM [800 mhz each core]) and then switch to Maximal Performance (Locked on 11x [3.06ghz each core]) when I'm starting up a game. I setup the performance on demand profile although I like switching between these 2 profiles like this, because its basically just a cool power saving profile and a gaming high performance profile. While locked on the highest multiplier (and undervolted) and stress testing, the highest temperature recorded was 50C. While gaming the highest I have ever seen is 40C. I don't know the EXACT temps from before but this definitely lowered my maximum CPU temps by quite a bit, I know they were not that low before. I'll test on battery eventually, it should be able to last quite a bit longer now (Was already getting slightly over 3 hours gaming). I didn't search the ENTIRE thread (Went to about page 20) and didn't see anything for the T9900 so I figured I'd post this here after a weekend of use so maybe someone else can use these settings to their advantage. Obviously don't just put these in and save the settings, but try these voltages and see if your processor can go lower, or adjust it slightly higher if needed, every processor is different.

 

thanks to this guide i lowered my temps from 86c to 65c a drastic decrease in temps. i will share my stable voltages foe those with the same cpu....all running stable with no problems.....

Gateway m6862 Intel core 2 duo t5750 2.0ghz
6x-0.9500v
7x-0.9500v
8x-0.9500v
9x-0.9500v
10x-0.9500v
11x-0.9750v

 

Hey I just undervolted my P9600 woo
Max multiplier at 0.9875v (rest is auto-ajust)
Now I'm at 48c instead of 52c under full load haha (yeah I know I didn't really need any undervolt)
I don't get you people running with 60s and 70s under load

 

Well that depends on the notebook's thermal system does it? -.-'' Think about it. And if you read the guide, it also tells you every CPU is manufactured differently.

 

Yeah I know I was just bragging my temps

 

Thanks Filpfire for the guide... excellent... I could get about 7c lower in the cpu temps but even in max performance (or even On Demand) in RM, the laptop acts slower. I don´t know why but without RM works faster
Any ideas?

 

I'm a noob, but try checking, if all of multipliers are checked in profiles, and profiles-perf. on demand

 

Thanks for the answer... and yes... all multipliers are checked... in all profiles...

 

I'm the owner of a sony vaio BZ11XN. Had a lot of problems with the fan, and I've send it to warranty 3 times for fan going bad.
Will this help me ?
Specs are Intel Core 2 Duo P8400 @ 2.26 GHz.
DDR = 3GB.

Thanks.

 

I appear to be limited to set values when lowering my voltage. Is there something I'm missing?

 

It all depends how much voltages you can lower. If it lowers you temps a lot, fan won't need to work as hard. I should help. But since you fan broke 3 times, don't expect it not to break again. But it should at least extend the life. And it's very easy to use.
I'd consider selling this laptop and buying new one. If you fan breaks and cpu overheats...wel... You probably know.

Not sure what you mean. There are values that you can't go below. But they should be lower then your original ones.

 

I mean the drop down menu for the multipliers on the profile page. The default voltage is 1.0750, one below is 1.0625, then 1.0500 and so on. Each one drops down by .125. Basically, I don't think it'll be able to handle the jump down to 1.0500. Am I able to input my own voltages?

Hope that clears it up?

 

Your drops are of 0.0125, not .125. So start with a .1 drop to like .9750 or something close.
You have to choose one of the choices given for the voltage.

 

Oh! Silly me. Thanks for clearing up the issue.

 

No, or not very easily. You may be able to do that in the files of the program, but it's not easy and you should wait for pro's to help you with that.

I understand, you are afraid, that those voltages are too low and you want to lower them by, say, . 05 instead of .125?
If you havn't got BSOD, then you really can't know how far you can go. BSOD is safe, if you closed you open docs and such. I suggest you run ortho and lower the voltages every 5 min until you get BSOD.

 

Hi everyone, thanks for great thread
can u explain the following:
my laptop, hp dv-5 has T5800 with multiplier ranging 6x-10x
my aim is to get maximum battery life
when i use RMclock the minimum multiplier and voltage (6x / 10500V.) result in 1.2 GHz CPU.
but i noticed that CPU can settle on 0.80GHz when idle or on battery (using vista power management)!! RMclock indicate that core (798) / multiplier 8x / voltage (1.0000 V)
what it is going on? is there is glitch? or what?

 

Did you disable (Uncheck) SLFM?

 

Just ordered a new Vostro 1720 with P8600 for my wife (with the 35% off coupon, 1.5% FWCB, and the $30 off for online ordering). Excited to try this out on that platform, given the success I've had with my M1330. I'll check back in after it arrives with the results.

 

i read the guide and little bit confused about multipler part.
So am i suppose to undervolt the whole 'checked' multiplers
or just x11 multipler?
Also, if i need to undervolt the whole 'checked' multiplers,
do the volatage have to set to same for each multiplers
or can they be different?

EDIT: nvm, i DO have to change volatge for each multiplers

 

Correct, set voltage for each multi, however, your voltage may vary from multi-to-multi. It is recommended to test at each multiplier for stability.

 

So i undervolted my m1530 and
one thing i noticed is that whenever my laptop starts,
it starts in 'high performance' instead of 'dell recommended' mode
with AC plug plugged in,also same with only battery.

i only set it to 'high performance' when i play games but now
it just sets as 'high performace' whenever it starts which means that
i have to manually set it to 'dell recommended'
So is this normal?

 

Holy Sh**!!! I followed this thread thoroughly when it was like 30 pages. 290 pgs??? Anyway... has anyone got rmClock working on Win7? it pretends like it's working but temps don't change.

_Nate

 

It works fine for me W7, 32 bit. Although,temps in W7 are hotter. According to internet, because W7 needs more voltage or smth like that.

 

I was wondering, is that any way to permanently undervolt the CPU so that you don't have to run RM CPU everytime? I guess you have to set it in the bios?

 

Indeed. I noticed this too - my CPU is quite a bit hotter under Windows 7, nearly 10C more.

 

Hey great guide, quick question.

Is there a reason why the lowest VID displayed in each drop down menu for all multipliers is 1.0125V?

I see in most screenshots people can choose 0.9V and less...

Btw I have XPS M1530 with T8300


Nevermind I forgot to tick the mobile box under advanced cpu

 

Great guide.

One question, I have enabled the program to start at start-up but the stupid UAC comes up every time. Is there a way to bypass the UAC prompt on on reboot? I don't want to disable UAC, I have my reasons . .