The "Undervolting" Guide

my CPU temps hit 94 Celsius when i'm stressing out my 12x multiplier which is around 10 Celsius higher.

do i need to change any settings in Intel TAT?

 

what does it mean if Orthos Crashes but I don't get a BSOD?

Secondly, I also have a T9300, and am VERY confused about the IDA profile stuff mentioned before to unlock that final .5x multiplier. can somebody explain it to me?

 

I'm running a T8300 at 0.9250 for multipliers 6 through 11 and at 0.9625 for 12.

0.9250 is the lowest possible voltage for me.

 

great guide!
before idle- 48 max - 69( I have seen 70's on things other than the stress test)
after idle - 42 max - 62

I have been conservative so far in the process, working slowly on going to lover voltages!

 

so no RMClock update for new processors? that is a shame. i was really looking forward to underclocking my t400. i will just wait for NHC to update, i suppose.

 

Do this temps seem safe?
Running t5750 x12@ 1.0500V and ati 2600HD(500/600) at 570/700

 

I did this and didnt notice a change other than slightly lower temps...

 

so can I change windows power plan in vista after undervolt? it seems whenever I change from high performance to power saver, the voltage goes back to original, is there a way to make it work with all power plans? thanks

 

Try having RMC handle the power plan. I have not done that in Vista but the option is there.

 

thanks I got that working. so when choosing power plan other than performance on demand, I can only choose one mulitplier in PST screen, is that normal? also I lowered my p8600 voltage from 1.1375v to 1v at 9X and .925v at 6X, however when I look at cpu info tab, I can see the current vid jumps to 1.1375v and sometimes 1.2v at 6X under non stressful situations. but while I run orthos to stress cpu to 100%, the current vid shows correct voltage of 1v at 9X. why does it do that?

 

Not sure what's up. Try checking "mobile" on the advanced settings tab.

 

yea its checked, but are you able to select other multiplier with other power plans?

 

I'm not understanding the issue.
Under "Profiles" you have only one where mine shows 4?

 

When you expanding profiles and editing power plans of rmclock. Like picture above, I'm trying to edit max perfomance plan, it will only allow me to select one mulitplier.

 

That makes sense because that is what maximum performance means, no down clock.

So why not choose Power on Demand for AC and Maximal for Battery? Or am I still missing it?
Like I say, I have not used the RMC power plans so don't know how they act.
Are you trying to get your computer to not down clock while on battery, is that the issue?
Sorry to be so dense.

 

hey thanks, im just trying to figure out how to use rmclock for power management.

 

Just one more thing. Maybe we were not talking about the same thing in the beginning. I do have power management integration activated on this one (I forgot ).

When activated you will have that RMC plan available in your Windows power plans. For what it's worth.
:

 

so I got the power managment thingy, but do you have any idea about the voltage thing i mentioned earlier? "I lowered my p8600 voltage from 1.1375v to 1v at 9X and .925v at 6X, however when I look at cpu info tab, I can see the current vid jumps to 1.1375v and sometimes 1.2v at 6X under non stressful situations. but while I run orthos to stress cpu to 100%, the current vid shows correct voltage of 1v at 9X."

 

Is it possible that RMC is not reporting the vid correctly but is setting it correctly? Try CPUZ or Everest seems to report my current vid dynamically.

 

the cpuz displays constant higher voltage than rmc and I couldnt find where in everest home edition you can monitor voltage, but everest shows much higher cpu temp than both rmc and hwmonitor. im confused which one is more accurate?

 

CPU-Z v1.41 for voltages....

Use HWMonitor/RealTemp/CoreTemp to compare CPU temps.

Everest Home Edition - I am not sure if it displays the CPU voltages....

But in Everest Ultimate Edition -- Tools > Everest CPUID.

 

cpuz 1.41 won't work on my 64 bit but 1.47 I notice does not display cpu clock properly on my P8400.

Sometimes with changes to RMC you need to clear the registry and reboot and set it up again. Use wipeoutreg in the RMC folder. I've beat myself up and after wipe and reset all was fine.

If your Everest does not show voltage not sure what to suggest. But this one has nice temp and clock info if you need comparisons. http://www.hwinfo.com/

 

where can I find wipoutreg in the rmc? btw the cpuz 1.41 shows correct voltage.

 

RMClock_WipeOut is the actual name (you made me look you dirty crook)

It is in the RMClock folder. Double click the file and it will clear the reg entries.

 

ha i thought its part of the main program

 

Hey got a few questions......
I don't see the option to go lower than .9500 volts any ideas?
Got a lg p300 with a T8100 and RMClock 2.35

Have stress tested long a hour or so max....... but .95 seems to be stable so far and that's the lowest it can go even on the lower multipliers =( I hope they put out a new release soon and that they can go lower then .95 HAHA

 

Hi guys, i have a question regarding the use of locking the CPU to its maximum performance for AC use.

When i do this, my cpu stays at 2 ghz (its a T7250 so everything is OK) however i get random lowdowns to 1196 mhz, i've double-checked this using the "monitoring" window.

Is this normal?? Theoretically it should stay ALL the time at 2ghz so i don't know what is the reason for this

Cheers

 

Check your temps with HWMonitor. You may be thermal throttling.

 

No no chance at all... my CPU is working at 45-48 degrees at 2ghz locked, so there's no chance that thermal throttling is causing this...

I just have the feeling that RMclock doesn't have absolute and complete authority over the hardware speedstep thing, so therefore for brief times it brings it back to 1196 mhz (don't know what for but weh...)

 

Read the " Extra! Locking CPU to full speed/throttle" section of the Guide.

 

i based my tests on that as a matter of fact...

 

The random lowdowns are normal.
[In Layman's terms:] It all depends upon how compatible RMClock is with your system's BIOS.

Also, locking the frequency at the max will give no boost in performance, because EIST throttles the frequency according to the CPU usage/demand by the various apps.

You can try out CrystalCPUID, in place of RMClock, and fix a particular multiplier and voltage.

 

Why are your "Restore CPU defaults" boxes checked? I thought the drill was to leave RMClock parameters in place, once optimized and set. I used to get some plan reversions until I turned those boxes off. Also, some people seem to be using undervolting/VID settings AND throttling. It's one or the other. Throttling in the CPU business means slow down only, never up. I finally locked my rig at 12X and lowest voltage for AC and battery. Why? Because, if you look at current draw (or watts or temp), your CPU at idle, draws about the same power at ANY frequency. The load (gas pedal) determines the heat.

 

I guess I always left that checked so as not to interfere with boot up. Probably makes no sense now that you point it out. In the beginning I didn't have RMC auto start so it made sense then. RMC does occasionally foul up it's settings and I have to regclear and reset. Maybe that is why.

I do however like the dynamic clock changes. It definitely helps the temps.

+rep to you for pointing that out.

 

Jumping around 4MHz while running at 2GHZ is nothing for a commercial oscillator chip, especially after it's frequency output has been multiplied many times to clock the CPU. In fact, 4MHz/2000MHz*100=0.2% frequency tolerance. Forget it. Mine does it too. It has no effect on the functioning of your machine. Now give me a rep point and let me get back to Solitaire ha ha.

 

So by unchecking "restore cpu defaults" boxes, does it mean I dont have to run rmc at startup?

 

Whoa, now I'm getting confused. The way I see it is that RMC is an alternative user defined power plan that you load at startup just like all the other plans that come with your OS. It's just a better, more useful plan. The only reason for checking the boxes is to undo the RMC plan you're using at next boot. Kind of like a "stay manual" option. It seems riduculous to me to define a power plan and then erase it after every boot, so I uncheck the boxes and let my RMC plan "ride". Why anyone would want RMC to run manually is beyond me, but you can have the option to startup with one of Bill Gate's plans in place at every boot if you want.

 

Great guide!
Just by lowering the highest multiplier i lowered the load temps from my scary >90 temps to a cool 75 under load. Almost 20C!

 

Are all CPUs undevoltable?

I tried the guide in the 1st post, but when I arrive at the part where I undervolt, I click the VID tab and only one voltage shows up as an option(the one which is already there).

 

Not all, what CPU?

 

Ok then mine must be too old to undervolt, it's a Celeron M.

 

Celerons lack EIST (SpeedStep) --> (No undervolting)

You can use ODCM, but its effect on power saving is negligible.

 

Yes Celeron M do not have speedstep on it, its always running on its rated speed. Pentium M on the other hand is more efficient and the best CPU's to undervolt

I upgraded my Celeron M to Pentium M, its much much better in many ways.

Though if you somehow see a multiplier and voltage control in the main profile page, try lowering it anyway.

 

Is it possible for RMclock to change your hardware? I formatted my laptop with a T5550 cpu and my cpu speed is stuck at 999mhz. My multiplier is fixed at x6 and when i do cpu stress test it doesn't go up anymore. I used RMclock before i formatted and it's working well before as it ranges from 999mhz to 1.8ghz depending on my applications.

Anyone else have any incident like this?

 

No, it only makes the changes through software. What notebook?

-Make sure you have Speedstep enabled on your BIOS (if possible) and its not overheating.

What program are you using to monitor the speed?

 

hmm hey guys, i just installed a T7500 into my acer 5920g, and ive undervolted my 11x multiplier to 1.0875V... yet im still getting really high temps of 78C... any other suggestions?

My original temps were 83-84C when running the stress test, so i guess i've made some gains... other than that i still think that this is pretty dangerous to be around 78 on a stress test... am i being paranoid ?

 

My notebook is G1Sn-X1. There is no speedstep option in my BIOS. I use cpuz so far to check my cpu speed.

 

i am trying to undervolt my pentium 4 D on my old laptop. ya... its a full pentium 4. on the profile it doesnt show any multipliers. can i still undervolt somehow?

 

Not paranoid at all. Undervolting can help, but does not cure a bad cooling system. I would first re-seat the heatsink with fresh compound like Arctic Silver or other equally effective compound. If you're still running high, try one or more of the notebook fan control programs around. If those don't work (like for my ForgetYou A6120) you might get radical and wire the red +5 volt lead on the fan connector to a +5v source on the MB to make it run at 100% all the time. Contrary to a lot of misconceptions, notebook fans only use about 1.5 watts of power which is a drop in the bucket compared to the HDD, the LCD screen, and the CPU which can combine to use 35 to 50 watts.

 

Thanks Scott,

Yeah i think i'll try reapplying some AS and see where i should go from there. Ill keep you guys posted