Downclocking to save battery live? - T-Mobile Samsung Galaxy S 4

Hi,
I am running a wicked v2 rom, had an idea yesterday to try to downclock cpu to potentially increase battery live. Used SetCpu, set ut to ~1.4ghz, governor is powersave. No performace hit that i can notice, outside benchmarks. On my first day now, will see how it works out. Anyone done that, any statistics?
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nib said:
Hi,
I am running a wicked v2 rom, had an idea yesterday to try to downclock cpu to potentially increase battery live. Used SetCpu, set ut to ~1.4ghz, governor is powersave. No performace hit that i can notice, outside benchmarks. On my first day now, will see how it works out. Anyone done that, any statistics?
Sent from my SGH-M919 using xda app-developers app
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ive been doing this since the first custom kernel was released. you get a few more hours depending on how much you downclock

downclocking always worked on my nexus 4
On a side note doesn't the powersafe governer set your phones cpu to the lowest clock speed at ALL times. As in if your minimum clock speed is 300mhz then its going to set your phone there forever?

just curious why you would buy a phone with 4 cores clocked at 1.9 ghz and dropping it???
thats like buying a 500 horsepower car, and detuning it minus 200 hp... whats the point?? Im not cracking a joke, its a serious question

Well, the plan is to get a zerolemon battery when it comes out. And i really cant see and performance hit, otherwise i would not really sacrifice... Assuming performance doesnt suffer, why not squeeze some battery life out and run a phone cooler?
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On and off system lag. Is it related the amount of apps installed?

I am currently running mikG 2.45 more freedom. Titanium backup loaded 335 Apps, which include system apps. I am thinking the maybe 200+ apps I have installed are the reason for the on and off lag.
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Apps maybe be paying apart in it but you say your running "more freedom" try running the stock freedom not the more or less or extreme or whatever he calls them. The undervolting may be limiting your processor. Also use set CPU and try to overclock a little. Im running synergy rls1 with stock freedom overclocked up to 1152 smooth as a whistle and battery is through the roof. try stock freedom and if that dont work pm me and ill help u out more if needed
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I was going to try aggressive freedom on the old one and 8.5. Wow overclocking to 1152 I thought that would drill my battery into the ground.
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running_onCode said:
I was going to try aggressive freedom on the old one and 8.5. Wow overclocking to 1152 I thought that would drill my battery into the ground.
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Overclocking doesn't really show a noticeable impact in my experience. Only if you are playing a CPU intensive game that pins your CPU at 100% then it drains slightly faster not to bad tho. Also if you use the "interactive x" governor it manages the cpu's frequencys to try to keep them as low as possible so you only using enough to do a task instead of going 100% for something that doesn't need that much power. It also keep the CPU at the lowest frequency you allow it to be when you shut off the screen. So if you set your Max to 1152 and min to 245 for example. When you shut off the screen it will stay at 245 and not jump around. That tremendously helps battery. It about 8p.m. here and i have had ghis on since 7 a.m. and I'm at about 30% and that's with quite a few text, 2 - 5minute calls, about 20 minutes of games, and an hour of music. The only bad thing about overclocking is that if you go overclock to far for to long you can fry your phone. But ive been running 1152 for about 6 months and perfectly fine so i figure that's pretty good. If u have more questions or need help pm me
Edit: i forgot i also had about 20 min of internet/xda browsing on wifi and the past 45min on 3g doing the same thing haha
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Time to try it.
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(Q)I have a og evo and cant overclock it 1.2ghz.

I have a og evo I want to know why when I overclock to 1.2ghz it freezes my phone why does it do that ?
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Each Evo is different. Some of them can't handle that high overclock, or can't be undervolted very low. Each one is different, each has its limits.
I don't understand the big deal with overclocking. It burns your battery faster. I personally underclock, with little to no lag and is good enough for my casual gaming needs
Mine doesn't like a clock much at all. I can get about 1.1 before it starts locking up but even then it hangs a lot. I honestly don't see a difference from 1.0 to 1.2. Get a decent rom, good kernel and try out the v6 script an I almost guarantee you will like that better.
beaumontcali48 said:
I have a og evo I want to know why when I overclock to 1.2ghz it freezes my phone why does it do that ?
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Well for us to be able to help you, you would need to provide us with more details on how you are trying to accomplish this.
I use no frils cpu but have also tried setcpu and viperMOD I know that's the best way to overclock but is very confusing. Have any step by step instructions to of to 1.2 I know having higher voltages helps as well.
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Overclocking is overrated. If you need to overclock for every day usage, then something is wrong - at least in my opinion. Resource intensive gaming is different, but you shouldn't need to overclock for browsing, texting, casual games, etc.
Try out the V6 Supercharger script. I'm not currently using it, but have in the past and it seemed to make my phone more snappy. A lot of people swear by it and it's a great script, definitely worth a shot. There are other things you can do to speed up your phone without overclocking. I'd try other options first since overclocking will chew through your battery. Increase the dalvik vm heap size, there are plenty of free apps on the market to help with this task. Uninstall apps you don't use, I'll bet that you never use some of the apps on your phone. Back them up with Titanium Backup and you can restore them if you ever need them again.
In case you didn't already know, the Evo can't overclock past 1.2, I'm not 100% sure why - it has something to do with the processor.
Supersonic Evo 4G | MIUI | Tapatalk
I never oc over 1075 and only when plugged in if i play a game I need to oc.for I just activate my charging profile and plug up and play 1.2 ghz is a good chance of doing serious.damage as these older scorpion processors get very very hot at that clock speed so they lock up to try and protect themselves from heat damage or they shut down the phone 1075 is as high as you should need to go for any games the evo can handle on the subpar gpu
Sent from my Classic-EViLizED-ToMAToFiED-EVo4g-
beaumontcali48 said:
...also tried setcpu and viperMOD I know that's the best way to overclock.
..
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I'm pretty sure viperMOD is more for undervolting than overclocking, which are not suppose to be combined together. I am running vipermod with max voltages - 50. Other nite was playing snes9x and was getting some lag with a game so I bumped max CPU up to 1.2. Phone went into a bootloop and had to superwipe and reflash everything. Don't know if its b/c vipermod + 1.2 CPU or just bumping up CPU. Didn't try it again.
Support TrevE!!
shift
Get a shift. Mine runs fine at 1.9. But usually run it art 254-1200 on demand.
{ParanoiA} said:
I'm pretty sure viperMOD is more for undervolting than overclocking, which are not suppose to be combined together. I am running vipermod with max voltages - 50. Other nite was playing snes9x and was getting some lag with a game so I bumped max CPU up to 1.2. Phone went into a bootloop and had to superwipe and reflash everything. Don't know if its b/c vipermod + 1.2 CPU or just bumping up CPU. Didn't try it again.
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You can overclock and undervolt together just fine. You just need to ensure that every frequency has a high enough voltage to run the processor at that step. My Evo is overclocked and undervolted just fine, although IIRC I can only push it up to 1.1 GHz . My tablet is 1ghz to 1.6ghz and is undervolted as well, though.
merge rls 2.0, iron monkey, Droid overclock because of the profiles options. I set up four profiles including one for temp. sometimes i'm underclocking and sometimes overclocking but only up to 1.19 to prevent freeze and boot loops. Only downside is right at open Droid overclock needs su permission but that is my choice since profile changes at open.
Very snappy afterwards.
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When I had the 4G, I was never able to go above 1118, or somewhere around that. It would have freezing issues.
On my evo shift, I was able to do 1.7 gHz (compared to stock 800 mhz) ok. 1.6 pretty reliabily, and I could run 1.5 all day long. Some guys could do 1.9. It just depends on the phone.
Actually overclocking and undervolting is counter-productive. What you should do, is read carhaulers and ropodopes guide over at vaelepak. Its give some good useful info about how to set up a good aosp rom. I'm underclocked, undervolted, and still getting 1400+ benchmarks. Check it out bro. You'll love the results.
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tommy0823 said:
Actually overclocking and undervolting is counter-productive. What you should do, is read carhaulers and ropodopes guide over at vaelepak. Its give some good useful info about how to set up a good aosp rom. I'm underclocked, undervolted, and still getting 1400+ benchmarks. Check it out bro. You'll love the results.
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Shoot the brutha a link
TrevE Supporter!
tommy0823 said:
Actually overclocking and undervolting is counter-productive. What you should do, is read carhaulers and ropodopes guide over at vaelepak. Its give some good useful info about how to set up a good aosp rom. I'm underclocked, undervolted, and still getting 1400+ benchmarks. Check it out bro. You'll love the results.
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What? Overclocking and undervolting are two completely different things, and they aren't mutually exclusive. Unless you can provide a good reason as to why it's counter productive to do both, I don't buy that at all. Just checked my phone, my overclock requires an extra 25 mV for all three steps I've overclocked. 25mV isnt much, and it certainly isn't going to kill my battery that much faster.
Besides, the only time the CPU is going to be entering these high power modes is when it needs to do work, and it's better to do work as fast as possible to go back to sleep. Would you rather wake up, do a mundane task for 5 minutes, then go back to sleep or wake up, do a task at 2x the speed while only consuming 30-50% more energy, then going back to sleep after only 2.5 minutes?
HUGI is real.
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Yea shot me the link too bro.
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First let me say I don't use viper mod or any voltage controlling mod.
On sense 3.0 roms such as mikg I over clock to 1152 and set the minimum to 384 and its smooth as butter. No problem and battery lasts all day.
On aosp however such as decks (I'm on it now) I underclock to 499 and leave the min at 254. Smooth as always and battery lasts forever.
Anything past 1152 is going to cause problems (at least in my experience) also the rom/kernel can effect how much you can overclock.
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Gary13579 said:
What? Overclocking and undervolting are two completely different things, and they aren't mutually exclusive. Unless you can provide a good reason as to why it's counter productive to do both, I don't buy that at all. Just checked my phone, my overclock requires an extra 25 mV for all three steps I've overclocked. 25mV isnt much, and it certainly isn't going to kill my battery that much faster.
Besides, the only time the CPU is going to be entering these high power modes is when it needs to do work, and it's better to do work as fast as possible to go back to sleep. Would you rather wake up, do a mundane task for 5 minutes, then go back to sleep or wake up, do a task at 2x the speed while only consuming 30-50% more energy, then going back to sleep after only 2.5 minutes?
HUGI is real.
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Its counter productive because it is giving less to something that needs more. (Don't take this post as me trying to be a ****. Just voicing how someone explained it to me a while ago)
Think of this as cars.
Lets say you have a nice fancy v8 mustang. Stock, everything is well, balanced.
If you start adding parts and get it pushing out 1000 horsepower (overclock) your most likely gonna need more feul (voltage) or at least stock amount flowing into the engine just to keep it running.
Now lets say you got that same 1000 horsepower gas destroying mustang and you start to lower the amount of gas flowing into the engine (undervolt (done in vipermod)) cylinders (CPU) wont get enough gas, it wont work, and your stuck going no where.
So if that made sense (did to me) then you can see why they are counter productive. Unless your using vipermod to overvolt (which idk if you can since I don't use it) then you can disregard this whole post
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Your car analogy is completely irrelevant. You can look up the exact voltages that the CPU runs on at every frequency, *even when overclocking*. Overclocking an Evo 1ghz to 1.2ghz takes maybe a 5% bump in voltage, and that 5% extra power is only going to be used *when the CPU is running at max speed* (which is only when there is a lot of work to do), and even then, it's *still better to let the CPU run at max speed with a tiny bit more power consumption than to cap the CPU at a slower speed and make it work for even longer*. Intel calls it HUGI, Hurry Up and Get Idle.
I know what I'm talking about, and I wish people would stop trying to argue with me based off of second hand speculation. I do this for a living, after all. There is absolutely nothing wrong with overclocking and undervolting, and it's the best way to get the most battery life *and* performance out of your phone, period.
Sent from my Transformer TF101
Gary13579 said:
Your car analogy is completely irrelevant. You can look up the exact voltages that the CPU runs on at every frequency, *even when overclocking*. Overclocking an Evo 1ghz to 1.2ghz takes maybe a 5% bump in voltage, and that 5% extra power is only going to be used *when the CPU is running at max speed* (which is only when there is a lot of work to do), and even then, it's *still better to let the CPU run at max speed with a tiny bit more power consumption than to cap the CPU at a slower speed and make it work for even longer*. Intel calls it HUGI, Hurry Up and Get Idle.
I know what I'm talking about, and I wish people would stop trying to argue with me based off of second hand speculation. I do this for a living, after all. There is absolutely nothing wrong with overclocking and undervolting, and it's the best way to get the most battery life *and* performance out of your phone, period.
Sent from my Transformer TF101
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Hmm, *interesting*. I believe the best answer to the OP was covered rather well earlier. It's all about your rom/kernel/hardware combination. With all the variables to consider as relevant, your best bet is to experiment and find what works for your device. Don't check set on boot untill you are confident the set-up is stable. Higher is not always better with overclocking. My device runs blazingly well underclocked @768max. Gets insanely great battery @499max. However my quadrants are better @ 1036 than at 1190.
Great thing about android is you can experiment and learn through trial and error.
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[Q] Any advantage to GPU overclocking?

Just bought the FrancoKernel updater app and was flashing the latest nightly and it asked what GPU speed I wanted. I went with the lowest but is there a performance bump going with a higher speed? Thanks.
Yes.
Small advantage but it is quite noticeable.
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Not very much.
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If you´re running highdef games or if you want to benchmark and see how much you can cram out of that phone, it´ll show. Otherwise, for normal usage, I´d say it´s quite pointless.
Beware though, not everyone can run the 512Mhz version, so try it out and if you get artifacts or weird behavior you have to go with the lower one.
Some Google developer explained why overclocking to 512 Mhz is basically pointless. There was a reason to why they chose to stay at a clock of 307 Mhz, but it's been noted that 384 gives a slight performance increase that drains no notable additional battery.
P3aK said:
If you´re running highdef games or if you want to benchmark and see how much you can cram out of that phone, it´ll show. Otherwise, for normal usage, I´d say it´s quite pointless.
Beware though, not everyone can run the 512Mhz version, so try it out and if you get artifacts or weird behavior you have to go with the lower one.
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It's pretty pointless all the time.
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Thanks for the response everyone. I will run with the 384mhz clock one since I am a pretty light user.

Undervolting CPU - More battery...

Is it worth it?
How do I go about testing the stability of the phone ( I don't want to reduce clock speed )
If you want your phone to work perfectly without loosing speed it's not worth it ( change wouldn't be noticeable )
Fears said:
If you want your phone to work perfectly without loosing speed it's not worth it ( change wouldn't be noticeable )
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Does undervolting really lower performance? You're sure you're not thinking about under clocking?
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ben-fisher-bro said:
Is it worth it?
How do I go about testing the stability of the phone ( I don't want to reduce clock speed )
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I predict a "my HOX isn't working right, I blame HTC" thread shortly after you try this.
But really, what are your expected gains from doing this?
Tingelholm said:
Does undervolting really lower performance? You're sure you're not thinking about under clocking?
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If you're not sure about what you are doing it won't lower performance it will probably result in a lot of crashing and error messages, I personally think it's not worth it for the amount of battery you could gain ( few minutes )
Fears said:
If you're not sure about what you are doing it won't lower performance it will probably result in a lot of crashing and error messages, I personally think it's not worth it for the amount of battery you could gain ( few minutes )
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Well, I have had it undervolted with -150mv in a week or something and I haven't experienced any errors and crashes. I don't have it for the battery, but for the temps.
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I've been under voting my s3 747m for over two weeks now, between 75 to 300mv lower, at 1.89 I'm running at 1200mv, although I'm only running it at 1.5.
To test it I use Stability Test app, on scaling for 3 hour runs, it will stress all frequencies.
If you find a crash you increase the voltage at that frequency, BUT, the best way to test it, instead of using scaling test, use the burn in one, but manually set your speed and let it stress test XX frequency for a long period, this Is where I found the most of my crashes.
This isn't an easy or a quick job, it'll require a good weekend of mucking around. I have all my speeds down to 5mv increments instead of the stock 25 the apps give you.
But so far, I don't get voltage related crashes, only the random KP caused by cm10 bugs.
If people are interested in the voltages for this phone I could post them
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I'm uv @ 1137 and oc @ 1.6 using arhd 9.1.0 faux 006u kernel and the phone is running better than ever
I use mhl hdmi with sixaxis and the battery used to die in a hour and it got really hot but now I played for a hour before work and it used 40% battery and it was warm but not overheating
But before u go playin around with things look into it all cores are different and behave different
This thread will tell u everything it even has a gragh on wot chips can do what
http://forum.xda-developers.com/showthread.php?t=1815466
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[Q] CPU Temperature exceeding 80°C! How dangerous?

Hi guys,
I understand that some heat when running resource intensive applications and games is to be expected but I believe I've passed into the danger zone, so to speak. When playing XCOM my CPU temperature quickly exceeds 80°C. From my googling on the matter I have come to assume that a temperature as high as 80°C is dangerous for the hardware of the device, but I have had trouble finding upper threshold limits for the model itself.
I guess my questions are as follows:
1) How damaging would running the CPU at 80°C for an extended duration (1hr +) be?
2) What would you consider the max acceptable CPU temperature to be?
3) Assuming it is as bad as thought, what are my options to reduce the CPU temperature, short of avoiding the problem applications? Underclocking seems to be a common suggestion, but I get the feeling that XCOM, or similarly taxing applications, may just fail to run or become incredible sluggish under such constraints.
My device is rooted and running Lean Kernel v2.4 along with the w03Slim ROM. Found here: http://forum.xda-developers.com/showthread.php?t=2638116
I've done similar test runs in the Temasek kernel with the recommended configurations through Trickster Mod and there is no difference, the CPU still exceeds 80°C when playing XCOM. After a week or so of googling, searching the forums, and digging through device manuals I feel like I'm spinning my wheels.
Any insight or advice you all might have is greatly appreciated.
Solved!
http://forum.xda-developers.com/showpost.php?p=52464294&postcount=2495
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Does not exceeds to 80c now?
You can try a custom kernel, i would recommend you BioShock kernel, with conservativex, max freq 2.2 ghz and undervolt 25 mV... No more over warming for me, great performance and battery life
Sent from my TWEAKED KITKAT note 3 powered by BioShock kernel
dramitt_live said:
You can try a custom kernel, i would recommend you BioShock kernel, with conservativex, max freq 2.2 ghz and undervolt 25 mV... No more over warming for me, great performance and battery life
Sent from my TWEAKED KITKAT note 3 powered by BioShock kernel
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Agree with this post, conservativex is a great governor to keep your cpu in check and not over throttle itself, also check out my thread I made here awhile back and apply the 8th post down. It really helped keep the temp down on my phone when playing graphically intensive games like dead trigger 2,riptide gp2 etc. Also if you have trickster mod or faux clock(really recommended) you can scale down your max frequency, that should really help keep it cooler and you won't see much of a performance drop (if any) while gaming or heavily using your phone.
Sent from my SM-N900T using xda premium
d12unk13astard said:
Agree with this post, conservativex is a great governor to keep your cpu in check and not over throttle itself, also check out my thread I made here awhile back and apply the 8th post down. It really helped keep the temp down on my phone when playing graphically intensive games like dead trigger 2,riptide gp2 etc. Also if you have trickster mod or faux clock(really recommended) you can scale down your max frequency, that should really help keep it cooler and you won't see much of a performance drop (if any) while gaming or heavily using your phone.
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Does it works with KitKat?
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dramitt_live said:
Does it works with KitKat?
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Yes I have applied it on kk roms too, phone idles and runs much cooler after applied.
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d12unk13astard said:
Yes I have applied it on kk roms too, phone idles and runs much cooler after applied.
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Sounds great.. But i have a question.. Some settings are for ondemand based govs wich are unstable with kk... So would you recommend to try this with interactivex? Or wich one. TIA
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