The "Undervolting" Guide

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This guide is written by flipfire along with the ideas, knowledge and help of other members. This guide covers most bits about undervolting while keeping it simple and accurate as possible. This method should also work with supported processors as the concepts outlined remains the same.

For this guide, I will be using a Santa Rosa T7500 processor on Vista using RMclock v2.35

I recommend undervolting to anyone with enough confidence and knowledge to do so. The benefits easily outweigh the risks. I dont see why one shouldn’t do this for a cool adn better notebook experience.

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What is Undervolting?​

Undervolting is a process which reduces the excess "voltage" given to the CPU using a software. This is widely used as a cooling solution and in my opinion more effective than any other cooling solution available (thermal paste, cooling pad, etc) at NO cost. Results can vary from 5c up to 30c drop in temperature, most will achieve an average of 10c.

Undervolting will NOT compromise performance at all. Underclocking and Overclocking (clock speeds) is whats responsible in regards to performance. Benchmarks will also prove that performance remains the same. Most beginners usually think and assume undervolting will sacrifice performance but they are wrong.

So you’re probably wondering how this works out and why Intel/AMD didn’t do this before hand..WHY? HOW?

Not all processor chips are built equally. Each individual processor have different voltage tolerances. Instead of Intel tuning each chip's voltage individually for the lowest voltage possible and risking instability, they made a fully stable standard voltage for all chips to run on. The problem is this standard factory voltage they put is quite high. Undervolting takes advantage of this by reducing it to the right amount.

This is also why some people can undervolt more than others even with the exact same model processor. It’s like the same concept for overclocking, some can go higher, some cant. Unlike overclocking, Undervolting will not void your warranty or damage your hardware.

Bottom line is.. There is no catch to undervolting.

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*Advantages of Undervolting
- Cooler CPU (5 to 20c cooler)
- More battery life (15-30mins more)
- Less Fan noise & activity
- Longer overall notebook life
- Eco-Friendly​

By reducing the voltage fed to the CPU, it will run much cooler. It will also draw less power from the battery which can give you an extra 10-30+mins battery life depending on the degree of the undervolt. Also a cooler CPU means less fan activity which again points to more battery life and less fan noise. A Cooler CPU could also lead to a cooler GPU if they share the same heatsink/fan. It is common sense that a cooler running notebook will last longer than a warmer/hotter counterpart. Heat is the killer of electronic parts.

*Disadvantages/Risks
- BSOD (Blue Screen of Death)​

You will get a BSOD at the very most if the voltages are too low. This is why we do a stability test to make sure we get no BSOD's. If the voltages are setup properly you shouldn’t get any at all. A BSOD seems to be the only risk for undervolting in my experience. So make sure everything is saved before you do anything. I dont wanna be responsible for any loss or hoo-haa's.

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You will need to download these programs (Dont install RMclock yet). Click to go on download page
- RMclock v.2.35 - (CPU clock utility)
- ORTHOS CPU Loader - (Used to stress the CPU and test for stability)
- HWmonitor - (Choose between 32/64bit on top left corner)

(ORTHOS and HWmonitor do not need to be installed . They are just .exe programs)

1)***Checking Max temps before Undervolt***​

Firstly, We need to find out how hot your CPU gets when under load to compare what undervolting can achieve.

i) Open HWmonitor. It will show the CPU/GPU/HDD's maximum, minimum and current temps. Today we are only going to be looking at the CPU core temps. I recommend using HWmonitor because its one of the best temp programs and its accurate but others will work too.

ii) Run ORTHOS CPU Loader. This handy program will simulate full cpu load for both cores.

iii) Click on the Start button and let it run for 10mins. Watch the temps shoot up to about 70-90c.

iv) Once its done stressing the CPU for 10mins, stop the program and record the maximum temp.

-I managed to get a scorching temperature of 79c.

2) ***Installing and setting up RMclock*** ​

Note: Vista x64 users will need to download the signed 64bit drivers down below to make RMclock work.

i) Unzip/Install RMclock into your notebook

ii) Run RMclock

iii) Click on the "Advanced CPU Settings" tab. The latest version of RMclock should automatically detect your CPU. If it doesn’t then click on the "Mobile" radio button near the bottom and tick "Apply these settings at startup". Now hit the Apply button

*AMD users need to tick P-State Transistors for a better undervolt



- If it asks you to restart the program, do so. After it has restarted go to the "CPU info" tab. Double check its showing the correct processor you have. On this page you will also see alot of digits moving up and down about your CPU.

3)***Setting up Profile***​

i) Double click on the Profile tab then click on "Performance on Demand" sub-profile.

- Tick "Use P-State Transitions" for both AC Power and Battery
- Tick all the index boxes possible, Make sure to scroll down and click the others
- Click Apply when all done.



Now we head back to the Main Profile page....

ii) Change the current profile in the drop down box to "Performance on Demand" for both AC Power and Battery

-Make sure all the index boxes are ticked. If you have SuperLFM or IDA i suggest leaving this out for the meantime. See down below later on for what these features do.

iii) Untick "Auto Adjust intermediate-states VID" near the bottom and hit the Default button. Your factory voltages should now show up. Click Apply.

4) ***Undervolting***​

In the main profile page, you will see different multipliers and voltages. What are multipliers?

Multipliers are incorporated with Intel SpeedStep Technology (see down below for full definition). Instead of the CPU running at full power all the time, multipliers are used to dynamically lower the clock speeds to make the CPU run more efficiently.

The more CPU power you need, the higher the multiplier your CPU will use. The higher the multiplier, the higher the corresponding clock speed will be. The higher the clockspeed, the more voltage it requires to run (vice versa)

i) First, We are going to start lowering the highest multiplier's voltage which is the 11x multiplier for me.

-Most people should be able to lower it by at least .100v to begin with the initial testing then slowly decreasing it from there on

ii) Always click Apply so the new voltage can take effect then do the stability test below. Keep doing this everytime you lower the voltage

5) ***Testing Stability*** (make sure all work is saved!)​

i) Open ORTHOS and HWMonitor again. (we will now see how much cooler it is)
ii) Go to the "CPU info" tab of RMclock (you can also watch the temps and stats here).
iii) Set the test type to "Small FFTs - stress cpu" to concentrate the test to the cpu.
iv) Run ORTHOS stress test for 45mins or more

- If it doesn’t crash when the stability test is done then you can go lower. I suggest lowering by .025v at a time till it BSOD or gives a warning error.

*If you get a bluescreen - then you have reached your limit and the voltage is too low. Once it restarts from the BSOD, it should revert to the last stable voltages. Keep a record of the good/bad voltages on paper.

*If you get a warning or hardware error from ORTHOS - Your voltage is also too low. Raise your voltage and try again.

-Once you have found your unstable voltage, i suggest raising the voltage up by 2 steps. This will put a safe margin away from your unstable voltage to ensure stability

**Its normal to get a BSOD or error at some point so dont freak out. It wont do any hardware damage.

**Most people are able to achieve .150v to .250v less than their default voltages for the highest multiplier. Again, it all depends on your processors tolerances.

6) ***Results***​

After several changes and stability tests i was able to lower it to 1.100v that’s .150 volts less than my standard voltage (1.250v). My undervolt isn’t as great compared to how low others can achieve but it has made a significant difference.

My max temps before undervolting was a scorching 79c now it is only 67c! That’s a big 12c shaved off at the cost of nothing.

I cannot accurately calculate how much extra battery life this will give cause of too many variables. I can only estimate about 15-25mins by perception as i havent got proper benchmarking programs and monitors. From what other users have posted, they saw an average of 10watt difference which should reduce the strain on your hot power adapters.

When you have found your optimum voltage settings, I suggest doing a further 3 hour stress test (when you have spare time) to make sure it is 100% stable.

Once you have made sure this voltage stable, you can now choose to make these settings run at startup:

Go to the Main Profile page > On the drop down box for startup choose "Performance on Demand" > Hit Apply

Now go to Settings page > Tick "Start Minimized in Windows Tray" and "Run at windows startup" > Hit Apply

To show your CPU temps in the Taskbar/System Tray > Right click the RMclock wheel icon and click "Show CPU Temperature"

TA-DA! Enjoy! Watch your notebook run significantly cooler

Side Notes:
-RMclock cannot recognize CPU's with half multipliers. It will round off to the nearest whole number thus downclocking. T8100/T9300/P7350/P8400/P9500 will underclock by 100mhz~
-The undervolt will only be in effect when RMclock is on.
-The latest CPU-z is bugged and will show incorrect voltages, use v1.41
-If you untick a box in the Main Profile page, you will need to retick them again in the 'Sub-Profile' page
-If your CPU is overclocked, make sure you undervolt when it is OC'd, so you can find the optimal voltages of the OC'd speeds.

7) ***Lowering and Testing Other Multipliers voltages***​

To make the most out of Undervolting, you can also lower the other multipliers to its optimum voltages. So far we have only set and tested the max multiplier. The lower the multiplier #, the less voltage is needs.

To do the stability test on the other multipliers we will need to disable the highest multiplier by Unticking it in the Main Profile page (11x multiplier for me) then clicking Apply. This will stop the CPU from using this multiplier meaning the 10x multiplier meaning this is the highest speed your CPU will reach. Each multiplier corresponds to a clock speed 11x is 2.2ghz, 10x is 2ghz, 9x is 1.8 (for my CPU of course)

Now you know the drill...
1) Lower the voltages slowly
2) Run ORTHOS test for 45mins
3) Double check in CPU Info page or CPU-z that its stressing and maxing out at the correct multiplier
4) Find the optimum voltage
5) Move on to the next multiplier by unticking the higher multiplier profile page then back to step 1

You do not need to test the lowest multiplier (idle) because we cant change/never changed the voltage. This voltage will always set at a stable voltage

Its a time consuming process getting the optimum stable voltages for every multiplier but it pays off in the end.

Note: After your done, make sure you re-tick the multiplier boxes in the "Main Profile" page then "Performance on Demand" sub-profile page, If you dont your CPU will be majorly handicapped

The lower the multiplier #, the more sensitive the voltage is to a BSOD! Most BSOD's from undervolting are usually because of unstable lower multipliers. For first time undervolter's i suggest leaving a small voltage margin from your unstable voltages.

Quicker Alternative: If you dont have to time to stability test every multiplier there is another way. Ticking the "Auto-adjust Intermediate States" box will fill in all the multipliers in between your Idle (6x) to your highest multiplier accordingly. It seems to work well for at most cases but theres no guarantee that all the multpliers are 100% stable, since it just fills it in mathematically. It seems to work fine for most people though.

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Extra! Locking CPU to full speed/throttle​

RMclock offers different power profiles. The Maximal Performance is profile allows you to choose only 1 multiplier which will be locked at that multiplier/clockspeed.

This profile is great for gamers, certain scenarios where full cpu is needed and people having issues with Speedstep not switching properly. I only recommend using this profile when the notebook is plugged into the AC adapter because it will increase the drain on your battery.

Locking the CPU will reduce the small throttle lag you get from the usual dynamic multiplier switching. It improved my PCMark05 points when i locked it to full speed.

To lock the CPU to full speed:
i) Go to the Maximal Performance Sub-profile page
- Tick 'Use P-State Transition'
- Tick the multiplier you want to lock the speed at (Choose the highest index #)
- Click Apply
ii) Go to the Main Profile Page
- Select the Maximal Performance on the drop down boxes for AC Power Current and Startup
- Click Apply

If successful, you should notice the RMclock wheel icon in the system tray turn completely red. This signifies the speed is locked to maximum speed.

This configuration will only lock the CPU when you are on AC power. When it is unplugged, it will change to dynamic switching (Speedstep) for improved power consumption. You can also choose to underclock the CPU when using the battery for longer battery times.

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Extra! How to Underclock CPU using RMclock​

The current profile we have is dynamic which means it will only use up as much cpu power as it needs. Underclocking is only useful if you want to completely limit your CPU's top speed for certain specific reasons. Obviously your notebook will run relatively slower depending on the underclock.

If you have tested the 'other multipliers' above this and haven’t realised it... then you actually have unknowingly underclocked. By unticking the index/multipliers in the Main Profile page, you are disabling the multiplier/speeds the CPU can use. So its common sense that we untick the higher multipliers. Make sure to hit Apply and check the CPU info page

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What is Intel SpeedStep Technology?​

"SpeedStep allows the clock speed of a processor to be dynamically changed by software. Running the processor at higher clock speeds allows for better performance. However, when the processor is run at a lower speed, its core voltage can be reduced, allowing for reduced power consumption and heat dissipation."

In basic terms, instead of the CPU always running at full throttle all the time, speedstep dynamically lowers the clock speed using multipliers to make the CPU run more efficient. It will only use up as much CPU power when it needs too.

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What is SuperLFM and IDA?​

SuperLFM stands for Super Low Frequency Mode. This ingenious feature lets your processor idle at an even lower clock speed by dynamically cutting the FSB in half. In turn, means even lower clock and voltages thus more battery life and efficiency. On a T7500 i was able to make my CPU idle on [email protected] instead of the default [email protected] . This feature is only available on the Santa Rosa Platform, T7xxx CPU's and above using the v2.35 of RMclock.

To enable SuperLFM, Go to the Main Profile page
1) Tick Index 0 which should be named SuperLFM
2) Set the FID to 6x instead of the default 8x. The default voltage is usually the correct one. If its not, then try putting it down to the lowest voltage possible. The lowest voltage varies from your CPU model
3) Go to the 'Performance on Demand' sub profile page and make sure the P-State Transition box for Index 0 is ticked.
4) Hit Apply after all done, then check the CPU Info page for the superlow frequency and/or voltage

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IDA stands for Intel Dynamic Acceleration. Basically it uses one core while the other rests. Im not really a big fan of this feature because its buggy and the gains are negligible so i just kept it turned off. This will probably help explain it better.

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RMclock for Vista 64bit users​

A digitally signed/secure driver is required for RMclock to run on Vista 64bit. We have finally acquired a digitally signed driver for RMclock!

Here is the link for the signed RTCore64.sys driver: (Virus free and tested)
www.flipfire.net/download/rtcore64.zip or here

Download and extract it to your RMclock folder and overwrite the old driver.

(NOTE: This driver is only for Vista 64bit. The XP 64bit drivers are already included with the standard installation)

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Other handy cooling solutions can be found HERE by the NBR cooling team

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search tags: undervolt undervolting undervolted underclock undervolt guide
Id like to give credit to blackbird (i followed his guide on my first time), John Ratsey for the signed x64 drivers, Rightmark, CPUID, ORTHOS and www.graphxservice.com for the banner and anyone else who i didn’t get to mention. (Let me know)


Did you like this Post? Did you learn something from it? Then vote for it in the NBR Amazing Content Contest

 

yay! Great job flip. Now i can link to this page instead of trying to explain it myself.

+reps

 

Great stuff, rep for you. Looking forward to more info.

 

An excellent guide. I have been undervolting for several years. Less heat also mean less fan noise.

I just keep the CPU stress test running and drop the voltage at the maximum multiplier at about 1 step every 15 seconds starting at 1.10V (for Intel Core / Core Duo). This very quickly finds the voltage which is definitely unstable and BSODs (keep a recod of the voltage as you drop it). I then put the voltage back up two steps and run an overnight stress test.

John

 

Nice work! Although I still can't give you rep points.

 

Pics of my T5300 undervolted to .950V running on Balanced Max clock 1.74 GHz
Max Multiplier 13x
http://i32.tinypic.com/1z3s7l0.jpg <--temps/CPU clock 800Mhz
http://i25.tinypic.com/24wawsg.jpg <--management settings
http://i27.tinypic.com/20kxfr4.jpg <--Recommended Index and volt setting. Keep computer on "Performance on Demand" for optimal power saving.

 

Thats underclocked to [email protected] . Thats major cpu handicap, undervolting isnt really making any gains at these settings

I suggest applying these settings under the "Power Saving" profile for superrrr battery savings

 

Good stuff, wish I had of known about this sooner!!

Thanks

 

I put it up to max clock when I'm running applications like Photoshop, but for using microsoft office, watching youtube, browsing the internet, and watching non-HD videos it works fine. I've had it clocked like this for quite a while now.

 

FLIPfire
maybe you should make a note saying that

"If the person overclocks his Cpu when gaming he should use that speed as the basis of his undervolting since overclocking when you already have a a decent undervoltage setup will give you more trouble".

(Please make the words more sensible)

 

Flipfire was a great help when I undervolted. There are also a lot of screens on what we did in this thread for people who need a little more help, specifically with Penryns.

 

Thanks for the feedback and reps

I will keep adding small info into the Side notes cheers

I use a similar underclock setup on my "battery saver" profile. I use it when im on the train to work typing up stuff using Word which barely needs any cpu power

 

I always use performance on demand. That way the CPU will crawl along when there's not much work to do but speed up when necessary whether on battery or mains.

I also don't trust IDA which seems to have no obvious benefit but its worth noting that RMClock 2.35 unlocks the SLFM voltage for use across the range so the 8x voltage can be dropped by about 0.1V.

John

 

thx for taking the time to post this and glad my guide (needed update, you provided it) helped.

 

deff the most comprehensive guide iv read

 

There is a difference between the usual dynamic profile and an underclocked profile.

An underclocked profile completely stops the CPU from reaching the high clock speeds. If you watch your clock speed while opening a program, you will notice that it will throttle up to 2ghz+ for a few seconds. You dont exactly need 2ghz to open up Winamp. The loading time/response will still be the same (depending on how low you underclock)

The dynamic performance on demand is what i pretty much use everyday. I only use the underclocked profile when i really need the battery life to last very very long.

 

The merits of capped vs uncapped clock speed needs further study. There might be overall power saving if the CPU is allowed to run at twice the speed for half the time, albeit at a higher voltage, and then goes back to sleep sooner.

Clock speed capping definitely has advantages when there are bad applications which suck as much CPU time as they can get while doing nothing useful (Google Earth has one message box which does that).

John

 

wow....somewhat impressive results over here. before undervolting, i was get max temps of 80C with idle around 61C (according to HWmonitor, i think its off a little bit) so after i got done reading this....i was really impressed and downloaded everything flip mentioned i needed for vista 64 bit. got everything working just great, just need to create my startup task as i just got done running my 6.5 hour stress test and the computer didnt crash or recieve any errors, whereas the two tests i did before this last one, it ran for just under 2 hours both times before it crashed. now i am seeing temperatures of 72C max (even after the 6.5 hours of running Orthos) with idle being 61C (i still swear the temperature is off.)

 

Great guide , +Rep

 

Umm dude have you had a look at your idle multiplier's voltage (6x) ??. Its as higher than your max multiplier! Rmclock must have detected your voltages incorrectly

Lower it down to 0.950v and watch it idle at 45c. If it BSOD's let me know..

6 hour stress test is quite alot. I only suggest doing 2-3hour at the most as it might put a strain on your CPU/FAN

 

yeah, i was thinking that too after i took another look at it...might have missed a step somewhere..so im re-doing the stress test. the only reason i did a 6 hour stress test is because i let it run overnight while i was sleeping.

 

I dont think RMclock detected your voltages properly. Set your 6-10x multiplier to 0.950v and leave your 11x the way it is.

why are you re-doing the stress test for? if your 11x was stable for 6hours at that voltage then its fine.

If you start getting random BSOD's its probably from 7x-10x multiplier. 7x-10x multiplier is whats used when doing medium cpu load (eg virus scanning)

You might wanna search what other T5600 users got from undervolting.

BTW, you can remove the other RMclock tray icons except for the CPU temp. All the other icons annoy me

 

i re-did the stress test because i changed the voltages altogether and i wanted to make sure it was stable. see attached pic. but now, after running the stress test, im curious about what temperature monitor to go by....HWmonitor reads 61C at idle and RMclock reads 47C. which one is more accurate?

 

This is unusual, they should both be in sync. Well mine is anwyay. I would trust RMclock more since it is a dedicated CPU utility and 45ish is the usual idle temps

Download Coretemp and check which temps it will show

 

coretemp shows the same temp as RMclock.

 

Good news then, you do not have a high temp idle. It was just HWmonitor

HWmonitor must be glitchy/buggy for your processor/system. Its must be showing the ACPI temps or something...

 

and how would i fix that?

 

Can undervolting too much, even though the system is completely stable, cause any damage?

I ask this because I have really low voltages that are stable but I was goofing off last night reading posts and I ran across someone who made a passing remark that undervolting too low can cause damage.

I don't know if this was based on anything or just an opinion. I can't find the post right now or I'd link to it.

As you can see, my system is pretty low on the voltages:

http://forum.notebookreview.com/attachment.php?attachmentid=16404&d=1205870577


HP DV9700T with a T9300

 

Well theres no definate proof about it, all hearsay. I dont think its possible to do any CPU damage by putting the voltage too low. Overheating and overvolting definately can.

I think the heat from not undervolting will kill your CPU faster. Undervolting only affects the CPU so you dont have to worry about other parts. Your LCD screen dying was because of the frail LCD cables HP put which is a known issue.

Ask John Ratsey, hes been undervolting for years plus hes on the RMclock forums. Ive only been undervolting for several months with no issues

 

Oh absolutely. I definitely agree -- undervolting didn't kill the LCD cable.

I think I was looking up old threads about the Vostro when I came across it but I wasn't searching for undervolting. I wish I could find that thread. The comment was said in passing so I don't know if they were just talking or what. I haven't seen any other negative comments about undervolting but wanted to ask for sure.

I was just curious if there was any other damage that could potentially happen or if I should play it safe and bump up the voltages a couple of notches, even though it's really stable (and very cool!) at these low voltages.

 

Well your voltages are ridiculous but i dont think its something to worry about. Raise it up to 1v if you really wanna play it safe.

Ill do a deep research if undervolting can definately cause CPU damage. Ive tried for looking it before but barely found anything..

yay instantly found my guide on google. Someone else made a T7500 undervolting guide nearly exact as mine but 2 weeks ago =/

 

You can't undervolt too much provided the CPU remains stable. The voltages are needed to ensure that the electrons move around as expected. Some people have been lucky and got CPUs which run at 2GHz at <1.0V. In the old days of Pentium M CPUs one used to be able to get the minimum CPU voltage down to 0.75V.

Intel's pre-set voltages seem to have a generous margin. I wonder whether one factor is trying to avoid encroachment on the lower power CPUs which have premium pricing.

John

 

Thanks flipfire and John. I don't know why my voltages are coming in so low but as long as I'm not doing anything terrible to the laptop in the long run, I won't complain!

I tried looking it up a few days ago but I couldn't find anything negative about undervolting either.

Anyway, I've found great amusement in watching RMClock in the systray. I'm very easy to entertain.

 

Something I should reiterate is that different CPUs with the same model number can have different characteristics, both in the pre-defined voltage range (at least for Intel CPUs) and the voltages needed for stable operation. There is, therefore, an element of luck in what you get. There seems to be some randomness in Intel's pre-set voltages.

I would also be cautious about having a big voltage increment between two CPU speed steps unless each step is confirmed by stress testing. The SpeedStep function means that a CPU will not stay fully loaded on an intermediate step but will move to a faster speed so a potentially unstable setting may not be revealed. However, it remains a problem waiting to happen.

Normally I let RMClock interpolate between the voltages for the lowest and fastest speeds.

John

 

Hi all, I'm new here(as a registered user) and wanted to say thanks flipfire, this guide is awesome. But can you nice folks help me out a little more here..?

RMClock won't start up with windows..? And the "Enable Enh. Stop Grant C2E" is auto-unchecked when come back from restart.. should I continue with the guide in this case?

P.S. IDA and DFFS are unavailable for me..
P.S.S CPU Specs(Everest Ultimate)

Mobile DualCore Intel Pentium T2370, 1733 MHz (13 x 133) Merom-1M
Instruction Set x86, x86-64, MMX, SSE, SSE2, SSE3, SSSE3
Min / Max CPU Multiplier 6x / 13x
Core Voltage 1.063 - 1.363 V
I/O Voltage 1.063 - 1.363 V

 

I haven't even applied AS5 and my idle temperature is at 40C and my performance is way better.

THANKS!

 

Yup! Right here! On my lowest multiplier (6, 600mhz) I have got it on 0.700v which is the lowest possible in NHC. Highest multiplier (16, 1.6GHz)is on 1.164v.

 

nevermind my previous post got things solved

 

I've added this to the list in the stickes so it's easier to find.

John

 

Thanks John.. appreciate it

 

Hey Flipfire, I notice in your tutorial that you were able to select voltages lower than v.95 at some multipliers. All of mine cap at v.95 in RMClock. There is no option to select lower even though the processor runs perfect at .95. Is v.95 the lowest a T9300 is allowed to go?

 

My processor is 2.2ghz merom, yours is 2.5ghz penryn. Faster processors needs more voltage to run thats why yours is slightly higher by default.

 

I believe Intel test each CPU during production and then hard-code the voltage range into each CPU. In theory all the CPUs of each family should have the same low end voltage (where they are all running at the same speed). The reality is that there is some variation.

John

 

Ive noticed this too but when i look at the Merom cpu range. The faster the processor the higher the pre-set voltages are, (even idle voltage)

 

I'll bet you guys will know the answer to this. My undervolt was stable for a week before my LCD went out. Games, video editing, just looking at the Internet. All was working wonderfully.

Since it's come back from repairs, with HP checking off a box next to "cable" and then someone scribbling "LCD" above it, now my undervolt has gone wonky and I'm getting the BSOD. The message is "irql_not_less_or_equal" and then it says it's dumping before a reboot.

With the repair sheet only saying "cable," I didn't figure they had replaced the motherboard. (There is not a box on the entire repair sheet that even says "motherboard" for the repair tech to check.)

Anyway, my power jack is loose and with the BSOD only when I'm running undervolted, if you were to take a wild (or educated) guess, would you say that they did replace the mobo and that's what's affecting the undervolt under my old settings before it went in for repair?

I guess I'll have to start my tests all over again because it's now unstable when it had been running great before I sent it in.

 

Sounds like RAM to me.

Edit: Just to check, take out one piece of RAM and see if you get a BSOD again. If you do get one, retry with the other piece reinserted and the other taken out. If it happens again then it may be that both pieces of RAM are bad, but that isn't very likely. Instead, if you don't get a BSOD after taking out one of the pieces, then it should be safe to say that the one stick is bad.

 

I dont think they have replaced the mobo as they didnt need too. They did do a crappy job on putting the mobo back, giving you a loose jack

IRQL bluescreen isnt usually the error you get for undervolting. I got an error like this before from bad RAM like comper said, but its possible it is the UV'ing

Try turning RMclock off for a while and see if your still getting it.

 

I ran the computer all afternoon long with the RAM in place like normal and RMClock off. No BSOD. I'll run it tonight with the RAM in place, RMClock on and see what happens.

Then I'll move to switching out the RAM to see if I can pinpoint this further.

I was just wondering since HP outsources the repair to Quanta if they replaced the entire mobo instead of just the LCD cable. This is all very peculiar!

 

Just posting an update. Something must have changed while it was in repair because it's definitely giving the BSOD only when RMClock is on.

I ran it all afternoon with RMClock off and no BSOD. Last night I started RMClock, ran undervolted and then BSOD shortly after. After the reboot, kept RMClock off and it ran with no BSOD for 5 hours (and then I went to bed).

It's not worth me re-testing the voltages with Orthos until I decide if I'm keeping this laptop. I don't know what changed but my values were stable until it went in for repair.

But my Vostro's supposed to arrive today so I'll undervolt that one for sure.

Just to be clear if anyone's on the fence about undervolting, I'm definitely not blaming the undervolt. Something has changed with my system since it's been in for repair because it was running very well and very cool before it was sent in. I'll definitely undervolt the laptop I'm keeping.

 

They must have changed some other parts. They could have done alot to it without you knowing. Maybe they forgot to put the processor back on haha

I think its time to get rid of that dv9700, its too troublesome and just not the same. Whens the Vostro arriving??