The "Undervolting" Guide

Any version of CPU-z after 1.41 will have inaccurate voltages for mobile chipsets. They stopped support for some reason. It will also not detect Super low frequency mode (800mhz/1600mhz) idle

You will need to use CPU-z 1.41 (see notes in the guide)

Oh press F9 in CPU-z and that should show the correct clockspeed.

CPUgenie shows 800mhz because it detected SLFM (Super Low Freuency Mode).

 

@Genna

Check out this thread about running RM Clock on Vista x64:
http://forum.notebookreview.com/showthread.php?t=220543

The bad news is that it might not work even if you set it up correctly, RM Clock hasn't been updated in almost a year, and it doesn't 'fully' support the 45nm CPUs.

 

RMClock works perfectly on Windows 7000 x64 and 7048 x64 without any weird tricks...

 

Your temps are ok (if not impressive), the HSF might not make good contact with the north-bridge (chipset) but I don't think it will cause any damage.

Seems like those nVidiots made some real progress with their GPUs if your 9300M is idling in the 20's. My 8400m GS idles around 56 C and hits 100 C after some gaming.

 

My 8600m GT used to idle at 61c. now it idles at 57c.

My T7300 used to idle at 56c, now it idles at 47c.

also runs super quiet, even when running a 20 min stress test (100%)

 

Thanks, CPU-Z 1.41 is indeed working correctly. I cant bring the voltage down because it is already running at lowest voltages

 

Heh. My 9500M GS idles at 70, barely overclocked. Hits ~92-95 gaming.

 

@ Alcabone
Thanks. I did al as it is written. But unfortunally the "Bad news" happened.
So this happens when you buy latest technology.
Any way my temperatures are very good without undervolting. They can be seen on the attached file.

 

Just tell Vista to go uckf itself and get Windows 7048 x64.

 

Nice. If you can give me a link to download it. I've already downloaded one from a torrent site and it was nothing else but Vista. I thought that some kid-hacker that wanted to be famouse, implemented the visual stile of Windows 7 on it.

 

I have a T9550 (2.66GHz) that I've taken about 10C off of, from an original max around 78C to a max to a current max to a new max of about 60C-62C!

Orthos has been running a little longer than an hour now. No blue screens or anything strange, but Firefox has crashed a couple of times.

Would that be related to the undervolting? Or is it just Firefox just operating normally?

 

It could be the undervolting, up the voltage to do a double check.
That isn't how Firefox has worked for me, I'd say Firefox crashes more from bad add-ons than faults in the engine.

 

yea, it could be an add-on. but it did it like 4 times during the 2 hours I had the test running. not really before or after.

for all I know, it may have just been because the CPU was under stress in general.

regardless, I'd like to report a drop in temperatures @ idle to under 100F and battery life gains of about ~50% (from 1:15 expected to 1:50 expected).

it's the 18" Sony. I'm very pleased with those numbers as-is. don't think I'll tinker anymore. I'll try the voltage settings with a game or 2 just to make sure all is well, then I'll be loading it like this from startup.

thanks for this awesome thread.

sidenote: I look forward to seeing those netbooks with the Atom processors undervolted. The core problem with them is the battery life (most getting no more than 2 or 3 hours). If undervolting can push them to 4 hours or better, I'll probably buy one.

 

Just google for it. I believe its illegal to share such links here. Google "Windows 7048 x64 torrent"

I doubt it. My IE8 is crashing some, but I just played Dead Space for 45 minutes no problems. I've done hours of gaming and benchmarking while undervolted and I only have good things to say.

 

It's not legal to share a link for a free beta?!? May be you are right. I don't want to argue, especially when we are talking about Windows. I don't like it, but I have to use it. Any way thanks.

 

@Genna
you can try other CPU power management software like Crystal CPUID: http://crystalmark.info/download/index-e.html#CrystalCPUID

 

Thanks, I'll try it once I finish work. I've already tested it on my office laptop and it's working fine, but it is with T5500 OEM. Let's hope it'll be the same on mine and P9600 QS.

 

hey guys, I have a friend who is not seeing the Advance CPU Settings section. It's just not there, apparently. He has a Toshiba Satellite running Vista 64-bit. the CPU is a AMD Turion X2 Ultra ZM-80.

is that processor supported or related to the issue?

 

His looks like this:



as you can see, no advance cpu settings section.

anyone?

 

is the setup different for amd users like myself?

 

That is way too hot. :S

 

I'm amazed that that CPU didn't shoot out of its socket, blowing a hole in his case

 

Technically it isn't, about 100C is the cutoff point for these chips. I will agree though that it's best to keep the temps under 80C. With the temps the other poster had, it's likely the vents are clogged with dust because even an AMD CPU wouldn't normally run that hot.

 

Fujitsu-Siemens Amilo Pi 3525
P7350, Intel GM45, 2GB 800MHz, 250GB 5400rpm, BIOS 1.07c

multipliers: 6.0x and 7.0x (guess there's 7.5x too, but cannot be seen by RMclock)

default CPU clock is 2.0GHz with 1066MHz FSB (266MHz) and multiplier 7.5x

with RMClock, only 1.86GHz is available (explained in the first post).
CPU works stable with 1.0000V at that clock. no lower voltage is available.

worse than that is that I cannot set voltage lower then 1.0000V even on 6.0x multiplier.

and, the worst thing is that my chipset drops FSB to 133MHz at idle reaching 800MHz for CPU running at 0.925V, and that is completely unusable with RMclock because I have no SuperLFM box in the main profile list.


for now, underclocking is going on a standby.
have to find better utility.

 

Right now I have a P8400 with a 8x multiplier at 0.9125v.
The lowest setting I have is 0.8750 (which I get BSOD).
And around 40C under load.

I hate that RM Clock can't use half multipliers. My chip has to run at 2126 MHz now.

 

It's actually undervolting.

 

Guys,

Anyone here with P9600 QS CPU? If yes, could you please tell me what is the lowest VID you can set on your CPU? (usually the lowest VID is the default voltage of the lowest multiplier)

I'm asking because I got a X9100 but I will most likely swap it for P9600, as my X9100 QS has minimum vid of 1.0V - too much.

Thx!

@Genna, try CPUgenie - it has a signed x64 driver, and I am using it with my X9100 QS - undervolts like charm, but the CPU itslef is quite limited with that regard (too high minimum VID)

 

That's strange - for me, the lowest VID shown in dropdown list is 1.0000V.
Maybe it's about my BIOS or so.

 

If the lowest VID shown is 1.00V than most likely your CPU is in fact vid-locked to 1.00V

Minimum VID probing has nothing to do with BIOS (I'm talking about RMClock and/or CPUgenie) - it is actually done by directly asking the CPU via. one of the MSRs (Model Specific Registers) and CPUs usually don't "lie" in that regard.

Same as my X9100, which is the reason I will get rid of it...

You can try to software-unlock the undervolting software (RMclock is unlocked with the .reg file proided in the RMClock directory, CPUgenie is unlocked by clicking on "unlock" checkbox in voltage view) and try lower voltages than 1.00V, but there is a very small chance that will work. To verify - you need to see if the VID really has been accepted by the CPU (it will show up in monitoring graphs)

 

Thanks for the amazing tutorial! I successfully underclocked from 1.175v to 1.0125 on my Core 2 Duo 2.53Ghz. My CPU's hottest temp went from 89C to 75C (14 degree difference) and my fans seem to be running quieter now!

Everything seems to be running fine right now, i will be doing a stability test tonight.

 

any idea why my cpu wont go above 1694 mhz on battery, anyone?

 

my P7350 by CPUgenie:

0.8GHz - original 0.925V - stable (orthos prime) 0.925V
1.6GHz - original 1.000V - stable (orthos prime) 0.925V
2.0GHz - original 1.250V - stable (orthos prime) 0.950V

have to make longer tests (I've run 2h per freq).
if those freqs turn tu be stable ones, I'll add 0.050V and add CPUgenie to startup.

is there any point adding other (1.73 and 1.86GHz) freqs?
they are not used by BIOS, but they are recognized by CPUgenie.

 

Check these pics out:

 

now, everything is set, but on XP SP3 CPUgenie starts in disabled mode, and doesn't control CPU voltage even if I manualy restart application.

 

Check your power options. In the advanced settings, there should be an option that says something like "Processor power management". If your maximum power state is set to less than 100% on battery, that's probably why.

 

^^^


anyone know why the advanced cpu settings submenu option would be missing?

 

Hi, my CPU is a P8700, and gfx card is a G105M..

On idle, my cpu temps are usually ~20ish deg celcius , but after clearing startup programs, and restarting the com, i realised that the cpu temps are ~38-40 deg celcius..

I have runned ORTHOS for 10 minutes(attached is the image) and the temperature for the CPU remains the same.. Is there something wrong with CPUID or anything(opened CPUID before running ORTHOS)?

Thanks

 

Abit odd problem this time.. I set my fsb to 210 with setfsb but noticed that rmclock wouldn't lock the processor to full speed. I found out the processor is locked at 6x multiplier no matter what I've tried. This hasn't happened before and im not sure if it was happening before the setfsb.
Every program that claims to control speedstep has failed me and rmclock EIST is greyed out (enabled).

 

I got it to 10x multiplier by disconnecting the AC adapter.. but as soon as I connect it again it goes down to 6x! Also, I noticed that Im unable to change voltages with rmclock for some reason.
I read something on other thread that the system wouldn't recognize the ac adapter and wouldn't allow full speed or something, but that was DELL. This is G1Sn.

 

mmm. weird. good idea, but the max is 100.

 

Just one further question, I noticed IDA enabled that rmclock displays the 10x multiplier yes, but it also seems to use stock voltage with IDA enabled. I know IDA has a higher voltage than normal, but it just seems to use the stock one as if I hadn't undervolted at all. A jump in temperature supports this.
It doesn't display the IDA voltage, but the stock one (for T7250 IDA is 1,2750 and stock 1,1750, every voltagemeter I have shows 1,1750).

Is there any tool out there that can enable IDA and undervolt at the same time ? At full load the point of undervolting would be wasted because of IDA, but I do get a little bit performance increase with it.

 

Just a second check up.

I have done stress tests and tested just from normal use and everything seems to be stable.

Also, intense gaming (probably the most CPU intensive thing i do) seems to only bring my CPU to a temp of 54C when the stress test brought it up to 75C after undervolting. Im not complaining, its just a nice little surprise.

My temperature has dropped and my fans arent nearly as loud now. Thanks a ton .

 

How did you resolved the half multiplier (you have 9.5x at max performance)?

 

Hey,

Sorry if this has been answered before, but yeah 265 pages... @_@

My RMClock locks my voltages at 0.9500V for all the multipliers, however my 12x multiplier is running stable at 0.9625V so surely the CPU can handle lower voltages at lower multiplier settings. Infact, 0.95V is the default Vid for my lower multipliers, so im SURE that it can physically do lower. I've even seen screenshots of RMClock, with people with the same processor setting the voltages lower than 0.95 :X Anybody know how to achieve this?

My cpu is a T9300. The whole point of undervolting for me is to save battery life, but on battery, its rare that my CPU would ever hit the states of the higher multipliers, so having the Vid at the default setting is pretty useless to me

thanks

 

Unfortunately, there is no way - minimum VID is determined during the manufacturing process and can be different between different batches of the same model.

 

any word on using .5 multipliers?

 

use CPUgenie

 

I'm about to have the samsung X360 with the C2D SU9300. I wonder if this CPU's ok for undervolting and is it worth to perform the undervolting on this "low voltage" already CPU. Thanks.

 

I tried CPUgenie and it works for the most part, but it somehow forgets your settings across shutdowns. Comes up with an error message that the CPU changed and you need to reset the settings or something like that. I have since uninstalled it. Besides, it's not free. . .

 

That is the IDA bug of CPUgenie - although they promised to get this fixed for the post 1.1 release.

Apparantly CPUgenie chokes if IDA gets triggered during max FID detection process - giving it false indication of a different CPU (different max FID)