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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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Just checking,but under antutu CPU master,or setcpu,and Rom manager pro..it only showes 1 core ..my quadrant are around 3500 ..s-off running newts rl3,,,txs
Whoa...a lotof views,,but nut sure either
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I don't think I have an answer, but you have to ask a question before you get an answer.
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takota6 said:
Just checking,but under antutu CPU master,or setcpu,and Rom manager pro..it only showes 1 core ..my quadrant are around 3500 ..s-off running newts rl3,,,txs
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I was running newts rls1 and getting 3600 quadrant and 6500+ antutu. When I switched to rls3 everything went down...so back to rls1 for me.
Other people have pointed out and I find this to work, that if you use setcpu and check "enable profiles", the 2nd core is turned on. I went ahead and set a screen off profile of 192/192 (max/min). I"m experimenting with these values, though. It seems I can knock down my mA use (per Battery Monitor Widget) by using the profile. The cpu does appear to be scaling properly. Many people have said not to use any of these cpu things and I did have some trouble with setcpu previously but it seems to be doing its thing with RLS1 anyway.
takota6 said:
Just checking,but under antutu CPU master,or setcpu,and Rom manager pro..it only showes 1 core ..my quadrant are around 3500 ..s-off running newts rl3,,,txs
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Programs probably just are't reading it right.
Speaking generally, the 2nd core will sit idle until needed, so it may be 'offline' when those apps check.
Until we get custom kernels/kernel source, there isn't much that can be done about it.
Sent from my evolving Rezound.
Lunatic summed it up perfectly. There are 2 cores, but the applications can't "see" them
http://forum.xda-developers.com/showthread.php?t=1496934 If you read through this thread the OP talks about the mpdecision not working properly. Basically it's the file that governs when both cores are on etc. It is something that can affect synthetic benches, but not real world performance. Probably why current ****s given by HTC = 0. Quadrant = trash and benches are for jerking off to numbers which generally is not an indicative to device performance. But whatever floats your boat I suppose .
Kool txs every1,,and I do use benchmarks to how my current Rom or tweak us working,,most of us are visual and need a program to tell us how it is..but I'm glad there s alot of hardcore peps to do the schooling
Perflock. There is no CPU management. Using setcpu doesn't do anything...its all in your head.
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It's like using a condom with a hole in it. There's no purpose for it, it'll only cause problems or children.
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If you use setcpu or similar and change pretty much any settings it should force the second core to do work.
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Like a couple others have said kernel source is the answer
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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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Hi everyone, I'm running houstonn's RootBox w/ his 167MHz kernel. Can someone post a screenshot of their CPU voltages? These are the ones Im using, I'm not sure if they are too low.
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I find that anything under 700000 leads to instability on my phone, but if that works for you, by all means go for it.
wow, im using mystery kernel and i can't set below 800mv, use both kernel tuner and faux clock.
Been using this for a day, everything seems to work fine. I keep my max CPU at 702MHz and max GPU at 325
Edit- I also keep two cores completely offline.
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Tyler44346 said:
Been using this for a day, everything seems to work fine. I keep my max CPU at 702MHz and max GPU at 325
Edit- I also keep two cores completely offline.
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... Do you go a week between access to electricity?
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Tyler44346 said:
Been using this for a day, everything seems to work fine. I keep my max CPU at 702MHz and max GPU at 325
Edit- I also keep two cores completely offline.
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What's the point of max 702MHz? That's slower than my old HTC Aria...
I know to each their own, but that just seems to defeat the purpose of having a quad core smartphone.
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Jank4AU said:
What's the point of max 702MHz? That's slower than my old HTC Aria...
I know to each their own, but that just seems to defeat the purpose of having a quad core smartphone.
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I agree. With a decent governor, the device spends very little time at higher frequencies anyway, so there is relatively little additional battery drain... But I would imagine you'd run into a fair bit of lag for those times when the higher frequencies are needed...
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dandrumheller said:
I agree. With a decent governor, the device spends very little time at higher frequencies anyway, so there is relatively little additional battery drain... But I would imagine you'd run into a fair bit of lag for those times when the higher frequencies are needed...
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Yeah, that's what I was thinking. Can't be terribly snappy with that setup.
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Like you guys said, with a great chipset, using low frequencies doesn't really take away from the performance, I only notice a slight difference, but my battery was lasting about 1 day 8 hours with 3-4 hours screen on and WiFi on, one to three bars, so not much battery gain. That's why I only used this for a few days testing. That's the whole reason why I posted this thread, I'm trying different settings.
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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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