What does under volting do? And what happens if I do it? And what's the right amount to under volt?
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kevinrubio1 said:
What does under volting do? And what happens if I do it? And what's the right amount to under volt?
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Undervolting reduces the amount of power the cpu uses, this helps to increase your battery life basically. How to do it? Depends on your kernel/rom, if they have the option, some kernels will require a special app, custom kernels can pretty much use any app that controls the cpu, you can start by reducing the voltage by -25mv, see how stable the device is, if it doesn't reboot, etc. If it does crash and reboot, you know that's 25mv below your processors limit.
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I'm just curious. A lot of the overclock kernels are also listed as UV. I'm assuming that it means undervolt.
What does that do? Is it a battery thing?
Thanks.
That's what I think to, maybe a little Google could help lol
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uses less power than stock kernal for said cpu setting. less power draw = longer lasting battery.
da_dragon2k3 said:
uses less power than stock kernal for said cpu setting. less power draw = longer lasting battery.
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Would that help overclocking?
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UV mean under-volting. And yes, it does help save on battery when overclocking.
This may be a dumb question but has underclocking a CPU been shown to damage it at all? Be it longterm or short? I know excessive overclocking can take it's toll on the life of a processor and was just wondering if the opposite was true also.
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Well I'll answer with my common sense: I don't see a negative effect on the chip. Underclocking too much could effect your performance and might cause reboots. Best way to go about it is trial and error. Find a stable setting and go from there.
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radrian92 said:
Well I'll answer with my common sense: I don't see a negative effect on the chip. Underclocking too much could effect your performance and might cause reboots. Best way to go about it is trial and error. Find a stable setting and go from there.
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I'm not asking about stability...I'm asking about actual damage. I'm aware of what underclocking does to phone performanne. I'm asking if someone knows either from experience or from information available somewhere if it can physically damage the processor...not just an assumption...but thank you anyhow.
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Underclocking does not damage anything hardware wise. In fact all recent processors do it very often for energy efficiency reasons. Your phone its probably doing it right now. It will go to its stock rated speed (1 GHz for photon) when you run a game or something else system intensive and it will clock back down to 216 GHz (lowest stock rated speed) when you quit or anywhere imbetween depending on load.
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EDIT: Meant 216 MHz. Sorry.
MultiDev said:
Underclocking does not damage anything hardware wise. In fact all recent processors do it very often for energy efficiency reasons. Your phone its probably doing it right now. It will go to its stock rated speed (1 GHz for photon) when you run a game or something else system intensive and it will clock back down to 216 GHz (lowest stock rated speed) when you quit or anywhere imbetween depending on load.
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Holy crud, 216 ghz????
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You cant underclock below what it was designed for and my regular kernels keep voltage below safe values so.....
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MultiDev said:
Underclocking does not damage anything hardware wise. In fact all recent processors do it very often for energy efficiency reasons. Your phone its probably doing it right now. It will go to its stock rated speed (1 GHz for photon) when you run a game or something else system intensive and it will clock back down to 216 GHz (lowest stock rated speed) when you quit or anywhere imbetween depending on load.
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Now this makes sense...thank you.
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magui43212 said:
Holy crud, 216 ghz????
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Its 216 Mhz...lol
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Yeah it shouldn't really have to much of an effect seeing as you are basically allowing it to do less. Just as long as you are not running to much for it to handle at its underclocked speed.... In theory at least.
I run both OC and UC setups depending upon what I'm doing IE "Charging" or "Screen off". And I've yet to see any negative effects.
Well seeing uderclocking makes it so its "walking" instead of "running" so it should be able to keep its "breath" longer.. less stress does usally me longer life. So i would say it helps your phone life overall and battery life longer overall
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No its like running with less weight
Damanis1 said:
Well seeing uderclocking makes it so its "walking" instead of "running" so it should be able to keep its "breath" longer.. less stress does usally me longer life. So i would say it helps your phone life overall and battery life longer overall
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Would I get better speed if I disabled 1ghz frequency and left 1.2ghz the default Max frequency?
Would it be faster?
Or slower? Or nothing?
Don't like the 1ghz frequency. But I notice my phone is a little slower when disabling. It.
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I thought you were making a kernel with 1.9 ghz overclock? That should be fast enough
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Kidding, correct?
1.2 > 1.0
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Good to see enyo has found where he belongs in xda. Asking questions and learning.
This is a big improvement enyo.
as to 1.2 feeling slower, your putting a massive undervolt on it. Try backing it off a bit and see if responsiveness comes back. Also, higher clock speeds can lead to better battery in theory by completing tasks faster and allowing the CPU to govern back down to a idle state.
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neh4pres said:
Good to see enyo has found where he belongs in xda. Asking questions and learning.
This is a big improvement enyo.
as to 1.2 feeling slower, your putting a massive undervolt on it. Try backing it off a bit and see if responsiveness comes back. Also, higher clock speeds can lead to better battery in theory by completing tasks faster and allowing the CPU to govern back down to a idle state.
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Thanks. Your right. Backed to -75mV on 1.2ghz and faster response came back.
Also it because really fast after switching to the Medium Leakage.
I rarely let my phone sleep, so 1.2 is the maximum I'll go for speed/battery.
But, the more you UV, you get laggy if its too low, but stable?
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Enyo. said:
Thanks. Your right. Backed to -75mV on 1.2ghz and faster response came back.
Also it because really fast after switching to the Medium Leakage.
I rarely let my phone sleep, so 1.2 is the maximum I'll go for speed/battery.
But, the more you UV, you get laggy if its too low, but stable?
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Honestly -50uv across the board yields the best performance, battery life and reliability.
droidstyle said:
Honestly -50uv across the board yields the best performance, battery life and reliability.
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Is there a advantage if it's undervolted 100+ mV?
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Enyo. said:
Is there a advantage if it's undervolted 100+ mV?
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that would be called overvolting... yes performance may increase, but inturn added heat, less battery life and instability can occur with it.
droidstyle said:
that would be called overvolting... yes performance may increase, but inturn added heat, less battery life and instability can occur with it.
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So -50mV is just enough?
I'll do that. Your good with setups of oc/uv.
Seems really stable for me.
Trying Low leakage for better battery. But Medium is perfect right
Now.
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droidstyle said:
that would be called overvolting... yes performance may increase, but inturn added heat, less battery life and instability can occur with it.
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just tried your setup. And I didn't know how slow my phone was till I used yours. So undervolting to much does slow down your phone. And it Got hot out of no where.
Thanks
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What's the most battery friendly kernel?
I'm using nymphetamine.. what about you?
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In order to determine this one must flash all kernels and test each of them with the same ROM for a minimum period of 24 hours and then when they have finished that post their results.
For the record im using Franco kernel.
No doubt. Insecure kernel
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I'm using postinthewrongsection kernel.
It's the ****.
Smh...
Seriously, nobody can answer this question and yet it is still asked 20 times a week, best rom, best kernel, best modem, whatever.
It's completely subjective!!
What is good for you might be **** for someone else.
As jonny68 said already, try them out.
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nodstuff said:
I'm using postinthewrongsection kernel.
It's the ****.
Smh...
Seriously, nobody can answer this question and yet it is still asked 20 times a week, best rom, best kernel, best modem, whatever.
It's completely subjective!!
What is good for you might be **** for someone else.
As jonny68 said already, try them out.
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I haven't seen that, where can I download the postinthewrongsection kernel?
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Thread closed.
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brian6685 said:
I haven't seen that, where can I download the postinthewrongsection kernel?
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LOL!!!
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Tbh i would recommend any custom kernel that allows you to undervolt, i.e Siyah
i currently have my phone running 100mv below stock and my battery life is better than it was stock
Uv is useless in s3 seriouzly. How much can u save.
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Well think about it, 4 cores consuming 1400 millivolts each.
Undervolt by 100 millivolts and you have saved the equivalent current of 400 millivolts (100 per core).
Thats close to a third of the total consumption of one stock core.
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Undervolting is pointless unless you are planning on overclocking and want to reduce heat.
Battery savings from Undervolting are about 2-3%
This is insignificant and isn't worth the potential instabilities.
Plus it's not even a big consumer of power, The power the cpu uses is dwarfed by everything else in the phone.
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wong section. please ask Q in Q&A subforum
nodstuff said:
Undervolting is pointless unless you are planning on overclocking and want to reduce heat.
Battery savings from Undervolting are about 2-3%
This is insignificant and isn't worth the potential instabilities.
Plus it's not even a big consumer of power, The power the cpu uses is dwarfed by everything else in the phone.
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The CPU is still the largest consumer of power unless you have extremely bright colours showing on the screen. Plus the phone can be undervolted very far below stock settings as it is, so savings should be more than what you quoted. For gaming I'd say my mali patch would bring quite some advantage in terms of power, since the CPU lock is gone and ASV scaling on the GPU can actually take place now, Netarchy already included that into Ninphetamin.
woshiahboi said:
Thread closed.
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lol.. how'd that work out for ya
AndreiLux said:
The CPU is still the largest consumer of power unless you have extremely bright colours showing on the screen. Plus the phone can be undervolted very far below stock settings as it is, so savings should be more than what you quoted. For gaming I'd say my mali patch would bring quite some advantage in terms of power, since the CPU lock is gone and ASV scaling on the GPU can actually take place now, Netarchy already included that into Ninphetamin.
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Somewhere on XDA I've been reading about some1 testing high (nearly max) voltages against as low as possible voltages (but if I remember correctly it has been a single core CPU). His result of this test was that even with such extreme voltage differences he was not able to save one percent of battery.
While I'm not too much into CPU voltages and undervolting I can't say anything about it for sure. But I'll be looking for that article...
swent said:
Somewhere on XDA I've been reading about some1 testing high (nearly max) voltages against as low as possible voltages (but if I remember correctly it has been a single core CPU). His result of this test was that even with such extreme voltage differences he was not able to save one percent of battery.
While I'm not too much into CPU voltages and undervolting I can't say anything about it for sure. But I'll be looking for that article...
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I think I know what thread you are talking about and I completely disagree with those findings, at least on the S2 I did proper measurements myself with -100mV on various frequencies and the power advantage was almost equal to the CMOS power formula f*V² on full load applications. I advise people to stop comparing such articles from different architectures as the Snapdragons or the OMAPs as they have different types of power saving states which influence the measurements greatly. The Exynos is relatively "stupid" in terms of lower power states and relies heavily on DVFS scaling so voltage brings a greater effect on the dissipation.
hefonthefjords said:
Well think about it, 4 cores consuming 1400 millivolts each.
Undervolt by 100 millivolts and you have saved the equivalent current of 400 millivolts (100 per core).
Thats close to a third of the total consumption of one stock core.
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If you're so concerned with volts per core. Buy the North American version and run it on 2g lol
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Yeah well, I'm sorry if I complicated things. Just thought it's worth pointing out.
For anyone still interested: here
Probably you're right, as I said... can't argue with any of it and hopefully no1 takes my dangerous semi-knowledge as reference.
AndreiLux said:
I think I know what thread you are talking about and I completely disagree with those findings, at least on the S2 I did proper measurements myself with -100mV on various frequencies and the power advantage was almost equal to the CMOS power formula f*V² on full load applications. I advise people to stop comparing such articles from different architectures as the Snapdragons or the OMAPs as they have different types of power saving states which influence the measurements greatly. The Exynos is relatively "stupid" in terms of lower power states and relies heavily on DVFS scaling so voltage brings a greater effect on the dissipation.
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Well you learn something new every day! Thanks Andreilux :thumbup:
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swent said:
Yeah well, I'm sorry if I complicated things. Just thought it's worth pointing out.
For anyone still interested: here
Probably you're right, as I said... can't argue with any of it and hopefully no1 takes my dangerous semi-knowledge as reference.
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This is the same study I saw while I was using nexus s.
Tbh I completely ignored the fact that it was single core and different architecture when applying that info here. Oops.
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I'm just curious to see everyone's experience with the Faux kernel as opposed to the one that comes pre-installed.
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Capgun_Homicide said:
I'm just curious to see everyone's experience with the Faux kernel as opposed to the one that comes pre-installed.
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You have to read xda rules again.. Your free to use both of them and see it for your self without asking which is best in public!!
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Capgun_Homicide said:
I'm just curious to see everyone's experience with the Faux kernel as opposed to the one that comes pre-installed.
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I think they're both great you can't go wrong with either kernel. It's like choosing a lamborgini or ferrari, they're both awesome but it truly comes down to preference.
I think I got better battery with faux 31 but I under clocked and undervolted so I can't do a fair battery life test.
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SuperAfnan said:
I think they're both great you can't go wrong with either kernel. It's like choosing a lamborgini or ferrari, they're both awesome but it truly comes down to preference.
I think I got better battery with faux 31 but I under clocked and undervolted so I can't do a fair battery life test.
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I've noticed better battery life as well; not majorly, but noticeably. Although I feel it also has a little perfomance drop. Could just be me, though.
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Sorry for a question within a question, but what does undervolting/overvolting do? I've only ever tampered with MHz frequencies.
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Capgun_Homicide said:
Sorry for a question within a question, but what does undervolting/overvolting do? I've only ever tampered with MHz frequencies.
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Don't worry.
Undervolting is basically adjusting the voltages so the cpu uses less voltage aka electricity. It helps a little but it can make your phone unstable so watch out. Of you undervolt use the system tuner app on the market. You should definitely under clock if you want to save power too. When you undervolt be sure to underclock, and don't do it too low or your phone might freeze! That's why your shouldn't go so extreme on it.
Overvolting is basically adding more voltage to the cpu. There is no point in doing it for our amazes to be honest. It is already a battery hog. I guess it can help if you want to over clock a lot but there is absolutely no point in doing that.
In older legacy phones if you wanted to over clock because the cpu would be so weak, like 600mhz then you would have to overvolt to over clock to like 1ghz if you were lucky. Our devices are 1.5 ghz dual core and sense isn't THAT bad. There's no point in doing overvolt in this phone though.
PS, check out my rom in the development section.
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SuperAfnan said:
Don't worry.
Undervolting is basically adjusting the voltages so the cpu uses less voltage aka electricity. It helps a little but it can make your phone unstable so watch out. Of you undervolt use the system tuner app on the market. You should definitely under clock if you want to save power too. When you undervolt be sure to underclock, and don't do it too low or your phone might freeze! That's why your shouldn't go so extreme on it.
Overvolting is basically adding more voltage to the cpu. There is no point in doing it for our amazes to be honest. It is already a battery hog. I guess it can help if you want to over clock a lot but there is absolutely no point in doing that.
In older legacy phones if you wanted to over clock because the cpu would be so weak, like 600mhz then you would have to overvolt to over clock to like 1ghz if you were lucky. Our devices are 1.5 ghz dual core and sense isn't THAT bad. There's no point in doing overvolt in this phone though.
PS, check out my rom in the development section.
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I just saw it in Venom Tweaks and was curious. The most I underclock to is 1 GHz; cuts down the CPU maximum by a third and doesn't hinder performance to much. What voltage would you recommend at that clock speed?
P.S. I have I plan on flashing it to try it out when I get WiFi access. Trying to cut down data usage since I don't have WiFi at home.
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Capgun_Homicide said:
I just saw it in Venom Tweaks and was curious. The most I underclock to is 1 GHz; cuts down the CPU maximum by a third and doesn't hinder performance to much. What voltage would you recommend at that clock speed?
P.S. I have I plan on flashing it to try it out when I get WiFi access. Trying to cut down data usage since I don't have WiFi at home.
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1ghz is perfect. As for voltage it really varies but I subtract 75 or 50 mv from all voltages.
PS. Oh nice, hope you get wifi soon then.
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