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Nexus 4 Undervolting

I've always been a big fan of undervolting. These are the lowest voltages I can get stable at these common speeds. I found I can underclock the Matr1x kernel further than some others I have tried for some unknown reason. How low have you been able to go? Also, what programs do you use to test stability? So far, I have been running Antutu test completion as a measure of stability. Any suggestions otherwise?
288MHz - 650mv
1.02Ghz - 800mv
1.51Ghz - 1000mv
ROM: Bionic AOSP V3
Kernel: Matr1x 6.5

Noob question~ Why do people undervolt?

WarToilet said:
Noob question~ Why do people undervolt?
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To increase battery life,

The Long answer is that the CPU has a number of parameters where Clockspeed (MHz) and voltage (mV) are two. Clockspeed, well that is speed. Voltage is related to the amount of energy provided to the cpu, undervolting means that you feed the CPU less juice but demand that it runs at the same clocks. You are essentially starving the CPU,it uses less energy, but can become unstable if the voltage is insufficient to maintain operations. Manufactures always have extra voltage as a safety margin so power users can check their CPU bin (slow, normal, fast or faster) and lower voltages step by step until they crash the phone during a stress test, increase the voltage slightly and boom, your phone uses less battery power while being just as fast.

I undervolt to reduce heat. It makes a significant difference. The battery saving is minimal, but the temperature difference is VERY noticeable.

estallings15 said:
I undervolt to reduce heat. It makes a significant difference. The battery saving is minimal, but the temperature difference is VERY noticeable.
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Took words from my mouth. This this and this. It reduces heat, which in turn reduces battery use. UV by itself doesn't save a lot of battery, it's the consequences of it. I'm normally not a fan of UV, but with current N4 sw/fw it NEEDS it. It's way too high.
Interesting observation. As of recently my phone jumps up by 3-5c from 37-38 hover. Never used to do it before, not until i got it up to 50c for about half an hour last week. Previously it would stay steadily at 37-38, now it spikes up now and again during use. What's interesting about is that once it goes over 40c battery use increases drastically. So i wonder if people that have really good battery life don't have phones that go over that temp often and vice versa.

I haven't played around with the values too much yet, just a -100mV across the board. This seems to work just fine, so I might experiment some more..
Using Franco test-r69 at the moment.
Sent from my Nexus 4 using xda premium

I undervolt to prevent heating like others say. My Antutu scores drop like a rock when I'm at stock clockspeeds mostly likely due to thermal throttling. Now I can run it repeatedly without having scores drop. It saves battery and runs faster while running games even for very short periods of time, so I am a big fan of undervolting. :good:

Undervolt to reduce power usage, think of the stock voltage as normally being more than is required, think of running for a bus yet you have 2 minutes why waste energy when you can walk and still make it .
Undervolt for less power usage and less heat produced meaning battery performance is better (cooler battery is a more efficient one) and performance is up as you avoid any thermal limits in place .
Great stuff undervolting, I have managed to get -150mV across the board ( 1.5ghz @ 1000mV) and 288mhz is 162.5mV .

I came from a nexus s ... And one member of xda went to amazing lengths to show that undervolting really made very little differences in battery life ... And it def wasn't worth the instability .
He did loads of tests and I mean loads and basically showed that in helped so little that if you had a reboot you would use more power in rebooting then saving via undervolt
However . it is worth it for the heat decrease for sure
Sent from my Nexus 4 using Tapatalk 2

italia0101 said:
I came from a nexus s ... And one member of xda went to amazing lengths to show that undervolting really made very little differences in battery life ... And it def wasn't worth the instability .
He did loads of tests and I mean loads and basically showed that in helped so little that if you had a reboot you would use more power in rebooting then saving via undervolt
However . it is worth it for the heat decrease for sure
Sent from my Nexus 4 using Tapatalk 2
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The more the heat, the faster the battery drains. Since undervolting decreases heat, im sure it should increase battery life. Maybe not for browsing or calling, but playing a heavy 3D game.

is it normal that the higher the frequency the lower the voltage in setcpu?
screenshot: http://db.tt/k6r8c5oI
I'm quite new to nexus 4 undervolting, what's the average amount i can lower the voltages with? (i have a nominal CPU)
sent from my Nexus 4...

zakoo2 said:
how can you guys undervolt? is there an app for that? i bought Franco's kernel updater app, but there's no option to undervolt in there.
edit: just found an app called setcpu, is that it?
sent from my Nexus 4...
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You can do it from franco kernel updater, from frequencies and voltages - voltages - cpu voltages
But i dont recommend you to undervolt if you dont know what you do.
Sent from my Nexus 4 using Tapatalk 2

aimcr7 said:
You can do it from franco kernel updater, from frequencies and voltages - voltages - cpu voltages
But i dont recommend you to undervolt if you dont know what you do.
Sent from my Nexus 4 using Tapatalk 2
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I'm familiar with undervolting both on PC and on phone, but i had a Motorola defy before my nexus and undervolting there was a bit different.
sent from my Nexus 4...

zakoo2 said:
is it normal that the higher the frequency the lower the voltage in setcpu?
screenshot: http://db.tt/k6r8c5oI
I'm quite new to nexus 4 undervolting, what's the average amount i can lower the voltages with? (i have a nominal CPU)
sent from my Nexus 4...
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Click to collapse
How are you able to undervolt with SetCPU? I'm not seeing that option using CM10, and Harsh's kernel.

italia0101 said:
I came from a nexus s ... And one member of xda went to amazing lengths to show that undervolting really made very little differences in battery life ... And it def wasn't worth the instability .
He did loads of tests and I mean loads and basically showed that in helped so little that if you had a reboot you would use more power in rebooting then saving via undervolt
However . it is worth it for the heat decrease for sure
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
Former nexus s user here, the reason nexus s didn't benefit in battery life much was that it only had 1 core, and used a higher nm manufacturing process, 65nm -> 28nm. Lower voltages in the 28nm means that it multiplies the heat/power savings more than a 65nm, and the 4 cores multiply the savings by up to 4.

FatalityBoyZahy said:
How are you able to undervolt with SetCPU? I'm not seeing that option using CM10, and Harsh's kernel.
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don't know, it was just there. did you try to reboot after installing the app?
I'm on Franco's kernel btw.
sent from my Nexus 4...

Pls what are the right values for under volting Samsung captivate
Sent from my SGH-I897 using xda premium

I am new to this and my battery goes +40°C when I play simple games... I am running Franco's kernel r71 should I do UV? If so how much? Thanks in advance
Sent from my Nexus 4 using xda app-developers app

xtremer92 said:
Pls what are the right values for under volting Samsung captivate
Sent from my SGH-I897 using xda premium
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this is the lg nexus 4 forum.
sent from my Nexus 4...

My phone heat so my and also drain battery

Hello forum I really have this problem since I install the firmware v20A. Basicly is when I use the phone for small games the phone start to heat like crazy and the drain battery is super fast I'm using tegra overclock to control the speed of the gpu using two cores and gpu 200mhz... Then when I use it for heavy game like batman I put the 4 cores and gpu in 330 the battery drain to 10% in 20min
how I can control that I have to say I'm heavy user but not as much as my phone long 5 hours when I don't use it much what can I do I'll appreciate ur help
Enviado desde mi LG-P880 usando Tapatalk 2

All 4x users are suffering from this problem
But don't worry heating is normal for tegra3,every tegra3 devices are heating and drains battery because it's 1.5ghz quad core
More cores more power and also more battery consumption
Sent from my LG-P880 using xda premium

But is it normal that the battery drain is in about 4 normal use 6 hours sleep mode and 30min gaming mode
Enviado desde mi LG-P880 usando Tapatalk 2

Before I installed cyanogenmod. I rooted my device and removed bloatware. With screen off time, my device could last for days without charging. With screen on time, the device could last around 4-5 hours depending on display brightness and Wlan.
So, if your device lasts around 4-5 hours, then it is pretty much standard.
Yes, the device heats alot during usage. I suggest using 70-80 % brightness at max while using it. I dont play games, so I dont know what to suggest during gaming.
Dont put your phone into a pocket when its hot, you might break the display.

Well it seems the only solution is to use a 4800amp battery that seems to work better even when is thicker
Enviado desde mi LG-P880 usando Tapatalk 2

peterparker6018 said:
Hello forum I really have this problem since I install the firmware v20A. Basicly is when I use the phone for small games the phone start to heat like crazy and the drain battery is super fast I'm using tegra overclock to control the speed of the gpu using two cores and gpu 200mhz... Then when I use it for heavy game like batman I put the 4 cores and gpu in 330 the battery drain to 10% in 20min
how I can control that I have to say I'm heavy user but not as much as my phone long 5 hours when I don't use it much what can I do I'll appreciate ur help
Enviado desde mi LG-P880 usando Tapatalk 2
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yeah don't worry about it all tegra phones have this problem. i fixed mine by getting the HTC One international version and selling this crap.... much happier now.

That one is extrenely expensive above 700$ like the SIV
Enviado desde mi LG-P880 usando Tapatalk 2

Xperia TX hot issue

My Sony Xperia TX gets hot while playing games.It starts getting hot just after a gameplay of 5-10 minutes.
Is this normal.And is this providing any harm to my Sony Xperia TX ??? It gets hot from the upper side of the phone, both front and rear.
Thanks.
Sent from my Sony Xperia TX LT29i using xda app-developers app

That Depends on The room temperature that you in if your room is some kind hot the device will become hot too but if your room isn't hot that may harm your device if you continue to play
Sent From My Sony LT29i >Xperia TX<

It is normal. Just be careful though. Your phone is known to kill SDCards because of the heat
Sent from my LT25i using Tapatalk 2

ModiYasser said:
That Depends on The room temperature that you in if your room is some kind hot the device will become hot too but if your room isn't hot that may harm your device if you continue to play
Sent From My Sony LT29i >Xperia TX<
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What ?
So, if I'm on under sunlight with 40°~50° C temp, it will harm my device ?
-_-
Room temperature doesn't matter, as long as human can live in there
@nafay142
It's normal, because 28 nm processing, of course, heat will be challange in here
always check your CPU temp, even TX have thermal throttle that set CPU clock scaling down when reached "danger temperature"
If your device about 50° or 55° C, I suggest do not use the phone about 5 minutes, let CPU scaling down to 40° C or lower, after that, you can use your phone again

Honestly a CPU can withstand about 100C. But of course not CPU manufacturer would let it reach that high since there is always a kill switch. So I say there is nothing to worry about. Xperia has its own thermal throttling system. You can play until your palms sweat
One thing though. If you are using some kind of casing over the back of your phone, remove it.

Well, I don't want take a risk to heat CPU to 100° C
Even if my CPU can handle that
Actually, not all CPU can handle at same clock and temperature
Everything is about luck, how lucky you get "nice" SoC
My save risk value for CPU is 70°C, but remember not all CPU can handle that, and may kill your CPU in instant way
And if CPU getting hot it means lower performance

Yea mine too but its okbsincw it will zhutoff automaticly oncs reach danger heat
Sent from my LT29i using Tapatalk 2

Thanks for your help.how can I check the temperature of my phone??
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nafay142 said:
Thanks for your help.how can I check the temperature of my phone??
Sent from my LT29i using xda app-developers app
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I'm using Kernel Tuner
And my normal usage for using CPU is about 45° C to 51° C
Maybe more or less, the highest CPU I get when playing a 3D game is 50°C to 60°C for the most

CPU Info

I am using Carbon ROM 4.3 with Chronic kernal. The settings were at a min of ~1700mhz and a max of ~2200mhz. Before i set this I let the cpu temp cool to about 23 degrees Celsius. I then set the cpu governor to performance. Then I started running AnTuTu benchmark ver4. After the cpu integer test the cpu froze up. I was cooling my phone using a freezer with the phone on a paper towel which was on a bag of ice. The CPU crashed at the CPU float point test.
After another test I found that my CPU becomes unstable after 2160mhz.
The settings for the posted benchmark were CPU Min at 1674mhz and CPU Max at 2160mhz with the governor set at performance.

The minimum freq is mute when the gov is performance. Performance just keeps the cpu at the MAX freq.
Sent from my SPH-L720 using Tapatalk 2

Cloaker said:
The minimum freq is mute when the gov is performance. Performance just keeps the cpu at the MAX freq.
Sent from my SPH-L720 using Tapatalk 2
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What he said.
Also you can just put the phone in the freezer for a while and let it cool way way down and then run the test while leaving it in the freezer.
Sent from my SPH-L720 using xda app-developers app

eskomo said:
What he said.
Also you can just put the phone in the freezer for a while and let it cool way way down and then run the test while leaving it in the freezer.
Sent from my SPH-L720 using xda app-developers app
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I am aware of this. I did have it in the freezer until it cooled down enough. The problem was not overheating, it was the CPU becoming unstable at full load with the processor being overclocked. The phone was still cold but it went to a reboot or just turned off.

Gotcha. I missed that part. I wasn't fully awake yet at 4:30am.
Sent from my SPH-L720 using xda app-developers app

Ok buddy here is your issue buddy its all about volts and throttle limits ive been fine tuning oc steps on antutu, cf bench, geekbench2 and geekbench3. Im stable all the way up to 2106 so far I use ktoonzs kernel cuz it has more options in his app the control alot of the throttling and volts. Ok understanding what it means what the phone just shuts off or reboots when the phone shuts off and wont cut back on you either have to do pull the battery out or plug the charger in to get the phone to boot up that means you had a power overload it drawed to much power on the battery which means you neesd to drop volts on your max step. Now if the phone is just rebooting or if the app FC back to the home screen that means that you dont have enough volts for your max step you only have to add or substract volts on that one step not on the whole board the best way to do this is just by finding your volts for that max step first yes scores will be low but once you find the volts then you start adjusting the throttle limits that way you can control the heat of the cpu but once you find the sweet spot of that oc step move to the next one and start over again for the next oc step doing the steps I listed above I will post pics of what I gotten so far. On a further note I have found that the freezer trick hurts you more then gaining anything cuz if you cool the cpu and battery to much it will make the cpu run sluggish cuz its to cold to run and if the battery is to cold it makes the phone think it dont have enough power to run on that oc step and makes the phone reboot so bare in mine the freezer isnt always the best way to do this I found that if the battery is below 28c it will reboot the phone during benching and if the cpu is below 25c it sluggish as hell the best app to use is cool tool on the app store if you use kt kernel I can give you the direct path to monitor cpu temp like his app does hope this helps you understand alil better of whats going on if you need anymore info just pm me
The #1 misfit
of my crew of misfits

As you see in the 4 pic my score close to what the GT-I9500 are getting on antutu
The #1 misfit
of my crew of misfits

Overclocking

So, I overclocked my CPU frequency to 1836MHz and my GPU frequency to 450MHz and after playing a game for like 10mins, my phone gets really hot. I know its normal but I would like to ask, did I overclocked my phone too much that it can destroy my phone? And what is the overheat temperature for my phone(HTC One)? So I can monitor it.
Thank you
Sent from my HTC One using XDA Premium 4 mobile app

qwertyuiop404 said:
So, I overclocked my CPU frequency to 1836MHz and my GPU frequency to 450MHz and after playing a game for like 10mins, my phone gets really hot. I know its normal but I would like to ask, did I overclocked my phone too much that it can destroy my phone? And what is the overheat temperature for my phone(HTC One)? So I can monitor it.
Thank you
Sent from my HTC One using XDA Premium 4 mobile app
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Yes its possible to permanently damage your phone if your overclock is too much aggressive or your phone get to hot. Every chip is slightly different so you'll have to test your phone for each frequency steps you do. Like a computer, you should start overclocking in small increments till you reach a maximum stable config and then reduce it a bit for safety. And always monitor temperature, over-temping is your worst enemy when overclocking.
For the max temp question I don't really know, you might want to check qualcomm site for max safe cpu temps. Don't forget some other components doesn't like high temperature. Semi-conductors components life are reduced in high temp conditions and generally, lithium-ion battery doesn't like high temperatures...

alray said:
Yes its possible to permanently damage your phone if your overclock is too much aggressive or your phone get to hot. Every chip is slightly different so you'll have to test your phone for each frequency steps you do. Like a computer, you should start overclocking in small increments till you reach a maximum stable config and then reduce it a bit for safety. And always monitor temperature, over-temping is your worst enemy when overclocking.
For the max temp question I don't really know, you might want to check qualcomm site for max safe cpu temps. Don't forget some other components doesn't like high temperature. Semi-conductors components life are reduced in high temp conditions and generally, lithium-ion battery doesn't like high temperatures...
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So basically, overclocking can really destroy my phone? So, i guess ill just switch back to the stock one. Thank you
Sent from my HTC One using XDA Premium 4 mobile app

qwertyuiop404 said:
So basically, overclocking can really destroy my phone? So, i guess ill just switch back to the stock one. Thank you
Sent from my HTC One using XDA Premium 4 mobile app
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That overclock is not going to hurt your phone but the temperature can if it gets too high which can happen at stock clocking. I keep my phone's cpu at 1.134 Ghz and games run great with minimal heat.
Sent from my HTC One using xda app-developers app

Found the information about the temp here