The "Undervolting" Guide

Doesn't matter. Reduce SLFM to 6x.

 

Wow. I didn't even realize you could change multipliers! Thanks!

 

Before undervolting, my max multiplier (10x) runs at 1.2250V with max temperature of 78 C under full load.

After undervolting, runs at 0.9500V with max temperature of 55 C under full load! Whoa, thats 23 C difference!

 

I think our record was like 25c+

 

In a previous post, it is said that Vista creates an RmClock power profile. On my XP SP2 system, it seems to have done the same:



However I think RMClock is working fine, as the temps are lower than when it's not running. So I guess I don't need to select the RMClock power profile in XP? Just leave it as-is?

 

No,

Choosing RMclock as a power profile means you set the exact same power settings as XP but within RMclock. So it turns RMclock as the complete power management.

Go to your Performance on demand subprofile, click on the OS settings button on the top. You will see the exact same power settings XP offers.

 

I see, thanks. So - correct me if I'm wrong - the "power scheme" profiles just control things like HDD & monitor power-off and so on. RMClock offers its own set of such options (with a couple of extra nice options) that you can set instead. But it doesn't affect RMClock's undervolting which is always operating as long as RMClock is running.

 

RMclock will always take over the CPU power managment.

Making RMclock as the whole power management (HD, LCD, Sleep, etc.) is an option.

 

is it me or did anyone else find they can turn all they're multiplier voltage to the lowest setting ie for me it is : 0.9250V

Is this a good thing or a bad thing???

 

I really do hope you've stressed test at all the multiplier levels...
but other than that....that must be a really good chip for you to be able to do that!

 

A chip like that must be running about 2 GHz tops. My T8300 can go to .95V for <=10x while 11x takes .975 and 12x needs 1.0375.

@arjeee: it's good that you can turn them all down to the lowest V possible, that just means that there won't be any excess heat generated since you can run all multipliers w/ the same voltage.

 

Yep, me too. All mine are at 0.9250v. It's a 2.1MHz T8100 in a HP 8510p. Idle temp 25-30 deg, max temp ~40. It's been stable as a table for everything so far, even playing Crysis (which runs very nicely on this machine I must say, everything on "high" apart from shaders on medium).

Update: Got a couple of bluescreens after a few days of use (even tho it passed the stress tests), so adjusted top xpliers to 0.9500 and mid-range ones to 0.9375. No issues yet after another few da

 

mine is 2.5! :S! its a weird and worrying trend....which is showing up.....iv done 3 multipliers and it seems to be coming up with that sort of a pattern....iv tested each one by unticking the above multiplier and did the orthos test for 1 hour.

 

i kno wot u mean notyou but no one else with my specs has got it so low which is y i am slightly worried.....and i am actually wanting a bsod to come up now...lol...

 

Dont worry, your not the only one. Several penryn users managed to get it down to the lowest before..

Set the 11x higher if it makes you feel any better.

 

lol no no im quite happy as it is!!! im just wondering....once we finish unticking them one by one, when i exit the application, do i leave them all unticked and leave or shud i tick all of them up to 12.0x which is my final multiplier till the IDA thingy.

 

Once you have your final voltages, definitely retick them all. Indexes left unticked won't be used, and thus you'll effectively throttle your PC to the highest-ticked multiple.

The magic of Performance on Demand with p-state transitions is you get full processor power when needed, and absolutely minimum processor power when you don't - thus the best battery life possible without compromising any performance.

 

ok then thanks wintersdark!!! +1rep to flipfire!...thanks dude.

 

hi, guys, I bought Dell XPS M1530 yesterday and now trying to undervolt it- T8300, but...I have problems...all of my voltages are set to 1.137 and my cpu doesn't recognize properly in my cpu info folder- there is "unknown" in model info section...I am using the same operating system (ghost from my old Asus S96S) and everyting before with my old T7300 was perfect normal. Now my new cpu won't recognize by rmclock, what should I do? I tried restart rmclock, reinstalled it, nothing helped...please give me some advise.. ((

 

Im sorry but you cannot undervolt....



just kidding. This question gets asked too many times especially from XPS owners. It was just discussed the on the previous page or so.

Its fine to go ahead and undervolt

 

It won't work (((((((( I can't change highest volteges at highest multiplier under 1.1375, don't know what to do (((((((

update- ok, it work!!!!!!!!!! I was forgot to tick performance on demand in profile selection!!!

 

What do you mean by you cant change it? Can you explain it carefully?

Make sure you choose the Mobile option in Advanced CPU settings.

 

I was having great success with undervolting and had saved my settings. It wasn't until I started using the laptop on battery power did I notice that the cpu was limited to only 1.2 GHz. My T7250 shows 2GHz when running on ac power. I tried to check that all the settings were the same for battery and ac power. I just cant get it to throttle to 2 GHz. I have ida settings in profile unticked and everything else is ticked. Can anyone tell me what I am doing wrong?

 

I had this problem as well. My T9300 was capping at 1.8ghz while on battery initially. In RMClock, disabling OS power management corrected the problem for me. Just let RMClock handle *all* of your power management. I'm running XP, btw - maybe vista differs?


Also, make sure you've got "Performance on Demand" selected for both AC and battery on the profiles page.

 

I'll set rmclock for the full control. I checked and everything is on performance on demand. thanks

 

sorry if this has been asked before, but I can't read all 100+ pages of this thread...

What experiences have you guys (and gals) had with trying to undervolt processors marketed as "low voltage"? I have a Thinkpad x61s with a L7700 LV processor, and I am wondering how that my affect my attempts at undervolting. Is a processor sold as low voltage already more "optimized" by the manufacturer - i.e. will I see less room improvement than others?

Thanks,

Mac

 

Yes you can undervolt ULV processors. It should produce some results, but not as good as normal cpu's

Only one way to find its effectiveness.. try it a post back with the results

 

I tried this, I BSOD at 1.1250V for 12x so I set it for 1.150V (1.250V is the default) and auto adjusted the rest. I have a T8300.

Non-UV: 10min Orthos
core0:74C by HWMonitor
core1:77C by HWMonitor

UV:10min Orthos
core0:66C by HWMonitor 60C by RMClock
core1:72C by HWMonitor 67C by RMClock


seems pretty weak for me....

 

sounds like the voltages werent detected correctly. i have a T9300 and my starting voltage for my highest multiplier (non-ida) was lower than that. (1.1375V)

ida multiplier was 1.2125

 

you're right. I followed the directions on 1st page for when the processor is not recognized. Set voltages back to default, then my 12x multiplier was set at 1.1375V. I'll have to do this again....tomorrow.

 

IDA VID setting is what the T9300 uses for it's 12.5x multiplier (not shown in RMClock). The highest non-ida multiplier is rarely used - mostly just a stepping stone to 12.5x. So, the IDA voltage is the one you're most interested in undervolting.

If you don't tick the IDA box, your processor is going to be underclocked by about 5%. Note that you don't need to have IDA enabled in the CPU settings, just that it needs to be checked in the profiles.

 

You have it backwards there. IDA is hardly activated so the most important multi is the one under it.

If the IDA box isn't checked, your processor WON'T be underclocked, it just won't OC itself by that extra bit when it feels like it. I'm not sure whether it needs to be enabled in the settings like it seems you have it, since it's so rare an occasion it OCs it's not really worth it.

 

I'm still having trouble after setting the RMclock to full control instead of letting it integrate with the operating system. When it is on battery, my 2GHz processor is limited to 1.2GHz and when plugged in it runs normal at 2GHz.

 

I'm aware what IDA does.

The T9300 is a special case. It runs all it's multipliers on a +.5x basis, which RMClock doesn't handle. Thus, if you run at the max multiplier pre IDA, your CPU is actually throttled by 5%. This is readily, visibly quantifiable watching the CPU info page.

What's happening is that the REAL max multiplier for the T9300 is 12.5x. If you only enable up to the shown max of 12x, then your rmclock ramps your processor just up to 12x, not the full 12.5x it's capable of.

If you enable the IDA tick box, however, it'll go all the way to 12.5x (note that IDA shows 13x and the CPU info page still shows 12x - it never shows the half multipliers. However, the it uses the 13x IDA FID's VID setting to determine voltage at this 12.5x "hidden" FID - this can be seen change if you leave the 12x at one VID, and the 13x at another VID - when the CPU is under load with, say, orthos, it reports 12x multiplier, the 13x VID, and CCS and Throttle are equal when the 13x multiplier is checked.

This functions even when IDA is disabled in Advanced Chipset Functions, because - as I said - we're not actually using IDA.


In fact, this whole half-multiplier issue happens at every FID for the T9300. Open the CPU info page, and you get this:



Note the Core Clock Speed - 1246.85 mhz, vs. the Throttle - 1196.92 mhz. This is at 6x multiplier. This is a 4-5% difference. This applies at every single multiplier up to and including 12x. If you fail to tick 13x, that throttle is always in place.

To my knowledge this only applies to the T9300, though it may apply to some others as well.

 

As far as I know, yes, the T9300 is a special case, since it has a 2.5 Ghz clock. Most of the CPUs have a multiple of 200 for the frequencies.

 

Is it normal for the intermediate multipliers' VID to be higher than the highest multiplier?

And, I realised my 6x (normal, not SuperLFM) is 1.25v while SuperLFM runs at 6x 0.85v. Is this normal? Do I have to change both of them to 0.85v? Which is the Idle (6x)? Is it the normal multiplier at 6x, not SUPERLFM?

I'm undervolting T7300? Anyone undervolted it before? Care to share what's your lowest stable VID?

And when undervolting, do i have to disable Vista's power management? Or enable RMClock's OS settings? (e.g. changing both min and max processer states to 0% or 100%?)

 

Are you sure that under the " Advanced CPU Settings" your CPU is detected as mobile?

 

I am getting this error when trying to test my voltage. I am not getting any instability but Orthos is. Do I need to turn my voltages up a bit?

[img http://www.putfile.com/pic/8433718 img]

How do I post this^

 

I admit, I was very hesitant at first to do this, but I'm so glad I did. Lowered my temps almost 20C.

 

You should turn up the voltage since it isn't stable. Otherwise it could decide to be unstable during something important and then you're screwed. So do it just to be safe.

 

Ok thanks will do, I wasnt sure as I didnt get any of these errors when I undervolted my T60.

 

Managed to take 12-13c off the stock T5450 in my Gateway P-6831FX:

6x - 0.9500V
7x - 0.9625V
8x - 0.9750V
9x - 0.9875V
10x - 1.0000V

I'm now getting min temps ~37c and max ~55c.

 

This means you undervolted a little too much, it's important to use a voltage that won't give you any error.

Those are pretty good temps.

 

I have it set at mobile and apply settings on startup. Still stuck on 1.2 GHz when I am on battery alone.

 

Hi guys, I would like ask you how I could set my lowest voltage under 0.925V? I've heard that is possible with registry- tweak, is it true? I want have under 0.85V for my lowest multiplier...Thank you very much in advance for the help.

 

No its not true.

Its proven that theres no way to lower your idle voltages below 0.925v

The registry tweak doesnt work.

Go to your CPU info page, whatever it says for 'Minimal' is the minimum voltage your CPU can run at

 

This is interesting reading! Should I underclock and check the IDA or the 12x multiplier then ?

EDIT: And how do I do it ? I don't seem to work if I follow the guide (where I just decrese the voltage of the 13x multiplier instead of the 12x)

 

You have a T9300?

 

Yup, I have the T9300

 

Hi Thank For Thr Guide !

I Have A Gigabyte Notebook With A T7700 Processor

I Have One Little Problem When I Try To Reduce The Number Of Volt It's Changes In 0.125 Volts At A Time And Not At 0.25 Like You Specified !

What Should I Do ???

P.s

If A Blue Screen Happens, What Should I Do ?

Does It Go Back To Normal Without Doing Nothing Or Ther Is Something I Need To Do For It To Go Back ?

Thanks