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Dear All,
I've created this thread with the hope that fellow Nook Color users will share your undervoltage setting of you Nook Color!
Please user the following format for easy reference
CPU clockspeed - voltage
Here are my voltage settings!
300mhz - 1.0v
600mhz - 1.1625v
800mhz - 1.3v
1100mhz - 1.35v
1300mhz - 1.375v
I use Dalingrin's
Originally Posted by dalingrin
My settings for those who care:
300mhz @ 0.925v
600mhz @ 1.05v
800mhz @ 1.2v
1100mhz @ 1.275v
1200mhz @ 1.325v
Click to expand...
Click to collapse
No OC Settings as I use NC for web browsing/reading mostly.
300MHz 0.8125V
450MHz 0.95V
600MHz 1.075V
800MHz 1.1875V
900MHz 1.25V
It's fairly likely that undervolting the lower frequencies does almost nothing for power save because that's when the CPU is in sleep states anyway and partially powered down. It'll make more impact when the CPU is busy working on something and high clocked. But still the LCD is the main user of power.
Undevoltage does help with battery life
swaaye said:
It's fairly likely that undervolting the lower frequencies does almost nothing for power save because that's when the CPU is in sleep states anyway and partially powered down. It'll make more impact when the CPU is busy working on something and high clocked. But still the LCD is the main user of power.
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Click to collapse
Hi Swaaye,
I don't agree as I have personally observe an increase of 30% battery life through undervolting, especially to lower frequencies.
Through SetCPU, I know that the CPU of my Nook spends around 67% of it time at 300Mhz, 15% of the time at 800Mhz and 7% at 1200Mhz. By dropping the voltage at the lower voltage range, I do actually see much improvement in my overall battery life.
Regards
Stanley Lim
It's much more likely that you changed something else to cause a large battery life improvement like that.
-Wifi disabled
-Differences in GPU or DSP activity
-Lower screen brightness
-Bluetooth disabled
-Less CPU usage overall (fewer background apps)
If you want to prove me wrong feel free to run several full battery cycle tests with identical usage patterns varying only voltage.
been running with these settings for about 2 months now and has been vary smooth and stable. battery life has also been vary good. over night 7hrs only 1-2%
interactiveX / 16 bit
225 @ .8125v
450 @ 1.0v
650 @ 1.1625v
875 @ 1.225v
1200 @ 1.275v
stir fry a lot said:
I use Dalingrin's
Click to expand...
Click to collapse
How has your battery life and performance been?
I'm curious: How do these overclock/undervolt settings for the NC compare with the stock NT?
hi guys,
does anyone have a tried and working UV values for best battery life? I don't want any more performance, so I'm not looking for OC, but perhaps any idea what UV stays stable?
Well, it's easy the higher you OC, the more it will drain your battery. As for UV, I can't tell because the voltages are different for every device, Rom and kernel...
Sent from my LG-Stone from the Prehistory...
Nahh... Just kidding!
CM 7.2 Koboltzz KANG
IronKernel 32MB
Usually undervolting -50mv for each speed will work for most devices, although its not recommended to decrease that much for speeds below 800mhz since it will affect your phone's wake up speed.
And tegra 2 cpu controller only supports minimum of 770mv, going anyway lower than this value will not have any effect.
My advice, try UV -25mv for 500mhz, and the rest above is -50mv. Some o2x can go -100mv, but you need to be lucky to own such device.
Cheers!
Mine is working perfectly on -75.
But when i go to -100, soemtime freezes device, so i use -75 regularly.
trying -50 across the board now, seems to run stable.
brw, how does lower voltage hurt the speed?
I can't really explain clearly since I do not know the technicals, but from what I read in xda, it will affect your speed, meaning 1.2ghz running at undervolted setting will not run the same as at stock voltage. Maybe its an efficiency issue, I do not know.
I thing that i experience, If you undervolt too much the few lowest clock steppings, you sometimes might not able to wake the phone from sleep because there is not enough power to wake it up.
I hope my explanation help you a little, and hopefully someone with more experience can give you a better explanation.
using -25mv ate 1.1ghz and 1ghz, -50mv at 800 Mhz, and -100mhz (750Mhz so its 770mhz because hardware limitations) on all other frequencies!
-50 mv is the limit for the device don't use below -50mv. but it dependes on your device. mine cannot UV it always gives me SOD i think my hardware phone is crap
antec123 said:
-50 mv is the limit for the device don't use below -50mv. but it dependes on your device. mine cannot UV it always gives me SOD i think my hardware phone is crap
Click to expand...
Click to collapse
When did you buy your phone?
I have one of the 10 first phones sold in Sweden and I cannot undervolt mine at all.
Just wondering if there's any correlation between manufacturing time and UVability (yeah I just made that word up).
// Stefan
I run with 1100.. good compromise between speed and battery life i think
A lot of people say that overclocking the Nexus 4 is useless as it's so fast to begin with, but that turns out to be false, yes, it's useless for making e.g. games run smoother, as they all already do, but it's very useful for reducing loading times, and it turns out that the % of time saved is close to the % of increased clock speed.
My setup: Nexus 4, franco.Kernel updater v9.3.3, Franco Kernel #666, Jelly Bean 4.2.2 JDQ39, Governor Interactive. Angry pigs HD 1.1.0 app loading. Fresh reboot for each speed. I did three measurements for each clock speed and left voltages at Franco's defaults. I would suggest looking into the undervolting threads to figure out how low you can go with voltages, undervolting is good underclocking is usually not.
1026 Mhz 1025mV default Franco
15.4s
15.9s
15.7s
1512 MHz 1150 mV default Franco
11.5s
11.3s
11.3s
1620 MHz 1175mV default Franco
11.1s
10.6s
10.6s
1674 MHz 1175mV default Franco
10.3s
10.6s
10.7s
1728 MHz 1200mV default Franco
10.5s
10.3s
10.3s
Conclusion
12.5% faster clock speed = 8.85% faster load time, which means increasing clock speed is 70% effective at reducing load time going from 1512 Mhz and upwards.
40% faster clock speed = 35% faster load time, meaning that people who think running their device at 1026 Mhz is as good as 1512 Mhz are wrong. Nearly doubling clock speed nearly halfens load time.
The reduction in loading time is reduced a bit as you reach higher frequencies, but it's still 70% effective so every extra Mhz helps cut down the wait. Overclocking the Nexus 4 is meaningless in terms of increasing smoothness IN APP, but meaningful in reducing load times significantly and in increasing the responsiveness of your system.
please tell me for saving the battery and still maintaining a little smoothness
the settings to use
i use faux123 kernel.. i just need the voltage,cpu clock n governer settings
so overclocking makes things faster.. really? who would have thunk. and you just found this out?
my brother uses a galaxy s3, and after using it for a few months he tried my n4... he was amused how fast things open and how smooth everything was, and it was all stock frequencies. i think it makes no sense overclocking this beast, it is already fast enough. +/- a few seconds doesnt make that much of a difference but drains the battery significantly more. just sayin'.
zakoo2 said:
my brother uses a galaxy s3, and after using it for a few months he tried my n4... he was amused how fast things open and how smooth everything was, and it was all stock frequencies. i think it makes no sense overclocking this beast, it is already fast enough. +/- a few seconds doesnt make that much of a difference but drains the battery significantly more. just sayin'.
Click to expand...
Click to collapse
Sorry but little OC can help you save more battery in day to day usage. (If you are not playing only games on your phone).
Sent from SpeedMachine i9100
alen1901 said:
Sorry but little OC can help you save more battery in day to day usage. (If you are not playing only games on your phone).
Sent from SpeedMachine i9100
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Click to collapse
not according to my experiences, and i did play with oc/uc and voltage quite a bit. i always ended up going back to stock on the n4 (not on my old motodefy though) because of the drainage.
So, a 50% increase in clock cycles pushes the performance by a bit.
Who would've thought...?
well that's normal, overclocking = more power draining, more speed; just like with CPU or ram on pc, no rocket science here.
alen1901 said:
Sorry but little OC can help you save more battery in day to day usage. (If you are not playing only games on your phone).
Sent from SpeedMachine i9100
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Click to collapse
OC? Don't you mean Downclocking or Undervolting?
sigma392 said:
OC? Don't you mean Downclocking or Undervolting?
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Click to collapse
Nope , also OC can (in theory) improve battery life because the CPU finishes its task faster.
a pigeon delivered this message.... ** your welcome **
gohan040 said:
Nope , also OC can (in theory) improve battery life because the CPU finishes its task faster.
a pigeon delivered this message.... ** your welcome **
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Click to collapse
But er... Wouldn't it would theoretically need more power and therefore generating more heat than stock frequencies which in turn will have a negative effect on battery life?
sigma392 said:
But er... Wouldn't it would theoretically need more power and therefore generating more heat than stock frequencies which in turn will have a negative effect on battery life?
Click to expand...
Click to collapse
It REALLY depends. I'd say most day-to-day usage, an overclock can actually help save battery by 'racing' to sleep (hurry up, finish, drop to deep sleep on cpu AND radio). I think being on 3g makes it even more pronounced because you're letting the radio drop back down to a lower power state as well as the CPU. So if you need to quickly open an email attachment, and cpu is the limiter, it can help it finish, get off the network, and back to idle state faster and save some battery. Now if you go on running benchmarks instead where you just keep throwing more work at it that's a seriously different story. There is also a point of diminishing returns (usually 1 or 2 steps before the absolute limit, in our case about 1670mhz) but in general, a moderate overclock can help.
sigma392 said:
But er... Wouldn't it would theoretically need more power and therefore generating more heat than stock frequencies which in turn will have a negative effect on battery life?
Click to expand...
Click to collapse
I agree with u, but remember its a theory.. U finish faster so the time it uses more power is less....
^^Look at the post above me, he got a good example^^
The best of both worlds (if your phone is capable to do this) is when u UV and OC. U would use less power on a higher frequency. Win-win in theory.
But I know what u mean and its hard to believe, but I think that's what @alan1901 wanted to say.
a pigeon delivered this message.... ** your welcome **
If you are lucky, you can overclock using STOCK voltage for the maximum clock.
IE, i see many undervolting their phones by alot. I would just try 1150mV (default voltage for 1.5ghz) for your highest speed (OC as high as you can with this voltage), which means you are not using more power, but still making your phone faster.
Haven't tried on mine, but say 1.6-1.7ghz should be possible with 1150mV for a few at least.
No, 50% OC is not = 50% reduced load time
Let me summarize:
OVERCLOCKING > UNDERCLOCKING FOR THE AVERAGE (POWER) USER
You load a lot of apps, you don't play games or watch videos for hours, productivity is your focus. Depending on use you could save probably 1 - 6 hours a year (see assumptions below). Battery gains won't be significant, but spending less time with the LCD/Wifi etc on could give you some gains as the CPU is one of the lower power drain components.
UNDERCLOCKING > OVERCLOCKING FOR THE 3D GAMER
You spent a lot of time playing CPU intensive games, keeping the CPU cores at max clock speed for extended periods of time. In that case you could get some battery life gains at the cost of responsiveness and app loading times - your call.
IN MORE DETAIL
-------------------------------------------------------------------------------------
UNDERCLOCKING + UNDERVOLTING PROs/CONs
+ Reduces CPU temperature, if that matters to you.
+ IF keeping the CPU at max clock speed for extended periods of time, a lower max voltage could give you enough extra battery life to negate the time lost waiting for apps to load - your call.
- Increased load times - even on the Nexus 4 a lot of apps take > 10 seconds to launch, and don't forget in-app load times, reboots etc.
- No significant battery saving in most cases, potential for loss (if doing a lot of app loading you could even get worse battery life as the screen, wifi etc has to stay on for longer, and the screen is the main battery drain).
- Time spent finding stable voltages.
OVERCLOCKING PROs and CONs
+ Potential small battery life gain, as your device spends less time with the screen/wifi etc ON.
++ SAVES YOU TIME. I'm estimating 1 - 5 hours a year depending on usage.
- Times spent finding stable voltages and clock speeds.
-/- Apps does not RUN smoother.
Why 50% CPU does not = 50% reduced load time and why you test things
---------------------------------------------------------------------------------------------------------------------
It'd be more like 40-30% depending on relative clock speed. I did a simple test as we did NOT know that app loading was mainly CPU limited, could have been memory. And If load times didn't go down there wouldn't be ANY reason to OC and underclocking would be a good idea.
Assumptions behind an estimated 1 - 6 hours saved a year by overclocking
---------------------------------------------------------------------------------------------------------------------
Say that you're on average waiting 4 minutes a day waiting for apps to load, rebooting your phone, waiting for web pages to load, waiting for in-app content to load etc.
Overclocking can cut down that wait time up to 10%, that's nearly 1/2 a minute saved every day, 3 1/2 minutes a week, 3 hours a year. This means you can get a good return on the time it took you to overclock your device, assuming you'll keep it for a couple of years. So if that's the case, why not do it? You'll save some time and you'll enjoy using your device a bit more.
Currently I'm OCd at max 1674 Mhz @ 1225mV, otherwise using default Franco voltages and interactive governor. Stable and very snappy Might be able to reduce voltage and retain stability but this is fine.
zakoo2 said:
not according to my experiences, and i did play with oc/uc and voltage quite a bit. i always ended up going back to stock on the n4 (not on my old motodefy though) because of the drainage.
Click to expand...
Click to collapse
sigma392 said:
OC? Don't you mean Downclocking or Undervolting?
Click to expand...
Click to collapse
I said little OC. Example. Stock cpu clock is 1000mhz and 1000mv. Now, you OC your phone to 1200,1300mhz without changing voltage, or by increasing it a little bit(+25, +50mv, to make phone stable), it will use higher cpu frequency with the same voltage like on lower frequency or with a little higher voltage. So it would finish tasks faster, going to idle faster without getting any heat and give you more battery. On my nexus s and galaxy s3, galaxy s2, i tested it, and it helped (about 30min more screen on time for me). But if you play games a lot and doing some heavy tasks then underclock and undervolt are best for you. But on that beast of phone, i woldnt underclock it beyond 1.2, 1.3, not sure what frequencies are there. If you UC that phone a lot, you can easyly go with some weaker phone.
Sent from SpeedMachine i9100
is there any kernel that can overclock with 4.3?
Andre_Vitto said:
is there any kernel that can overclock with 4.3?
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Click to collapse
yes, most of them. some even overclock up to 2052mhz :victory:
simms22 said:
yes, most of them. some even overclock up to 2052mhz :victory:
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Click to collapse
like?
Check the Development sections.
This thread makes my head hurt.
Hello all,
I'm planning to buy a Xperia Z but I'm also interested by the Xperia ZR that has a better battery life but that is harder to find where I live.
So I'id like to know whether the Xperia Z has a good battery life, let's say a day in advanced use, and no lags if underclocked @800-1000MHz.
Thanks in advance.
http://forum.xda-developers.com/showthread.php?t=2150786
Sent from my C6603 using Tapatalk 2
If you buy an unlockable device (not from a carrier) undervolting with a custom kernel will make the most difference
@ kingvortex: Thanks for the link but I'd already read the thread and I didn't really find an answer. I saw that for some users underclocking wasn't working properly... Does the problem still exist ?
@ DrKrFfXx: Yeah I won't buy it from a carrier, and I plan to underclock the Z if I buy it, freeze or unistall some apps etc. But I don't want to lose performance. Is the interface and most of apps very smooth at 800MHz ?
Thanks.
NeoJeo said:
@ kingvortex: Thanks for the link but I'd already read the thread and I didn't really find an answer. I saw that for some users underclocking wasn't working properly... what about now ?
@ DrKrFfXx: Yeah I won't buy it from a carrier, and I plan to underclock the Z if I buy it, freeze or unistall some apps etc. But I don't want to lose performance. Is the interface and most of apps very smooth at 800MHz ?
Thanks.
Click to expand...
Click to collapse
Is laggy at that speed.
But don't confuse undervolt with underclock, mister.
Undervolt as the name implies, is lowering the voltage of the processor to generate less wattage and thus, less heat and battery consumption.
You can undervolt your device to consume the energy of the stock 1000mhz and retaining 1500mhz. Undervolting combined with a slight underclock, say to 1350 will achieve decent performance while mantaining great battery life.
DrKrFfXx said:
Is laggy at that speed.
But don't confuse undervolt with underclock, mister.
Undervolt as the name implies, is lowering the voltage of the processor to generate less wattage and thus, less heat and battery consumption.
You can undervolt your device to consume the energy of the stock 1000mhz and retaining 1500mhz. Undervolting combined with a slight underclock, say to 1350 will achieve decent performance while mantaining great battery life.
Click to expand...
Click to collapse
Yeah I knew it, that's just a habit for me to say underclock ^^
Anyway thanks for your answer. If at the end of the week ZR isn't available here I'll turn my choice on the Z.
DrKrFfXx said:
Is laggy at that speed.
But don't confuse undervolt with underclock, mister.
Undervolt as the name implies, is lowering the voltage of the processor to generate less wattage and thus, less heat and battery consumption.
You can undervolt your device to consume the energy of the stock 1000mhz and retaining 1500mhz. Undervolting combined with a slight underclock, say to 1350 will achieve decent performance while mantaining great battery life.
Click to expand...
Click to collapse
New to android systems, I want to try and improve my battery life and the last thing on my list after looking about was underclocking.. I've got a rooted z3 and the rom toolbox app, after reading the comment what would I need to do to get an ideal battery saver?
This is an outdated device, but since SD801 is so efficient, I gave it a try.
Warning - undervolting is a risky process. It may constantly crash your device, make it unusable or you can actually lose all of your data. Be aware.
So, after reading various articles about CPU binning concept, I thoroughly examined my device's potential. Note, that every device is different, regarding CPU quality and etc.
Anyways, I am running stock rom with Boeffla kernel. I actually gave up, when my device was getting hot - I don't like that at all. Since thermal throttling is really aggresive, I wanted to get away from that completely. And I did.
Currently my phone is heavily undervolted (by 0.1V to be exact) and to be honest, CPU temperatures now never ever exceed 50ºC. With stock voltages, I could easily reach 80ºC.
Anybody else tried doing undervolting? Share your experiences. I would greatly appreciate that.
what is the benefit of it?
does it give a better battery life............?
binadam23 said:
what is the benefit of it?
does it give a better battery life............?
Click to expand...
Click to collapse
The only real benefit of undervolting is to reduce temps. Even so it isn't recommended because of the risk of instabilities.
Saber.
Saber said:
The only real benefit of undervolting is to reduce temps. Even so it isn't recommended because of the risk of instabilities.
Saber.
Click to expand...
Click to collapse
lower temperature = lower power consumption = better battery life.
Kriomag said:
lower temperature = lower power consumption = better battery life.
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Click to collapse
Not necessarily. In my experience in kernels, undervolting only brings marginal power savings. Most battery drain is from open apps and from the display.
Saber.
Wake locks play a big role too I always turn off as may features as I can on my s5 verizon and settings database editor App to turn off more features than normally possible
Sent from my iPhone using Tapatalk
Saber said:
Not necessarily. In my experience in kernels, undervolting only brings marginal power savings. Most battery drain is from open apps and from the display.
Saber.
Click to expand...
Click to collapse
Not exactly marginal from my experience. It also depends on which frequency CPU is running. At higher clocks, lower power consumption is more noticeable than on lower frequencies.
airidosas252 said:
Not exactly marginal from my experience. It also depends on which frequency CPU is running. At higher clocks, lower power consumption is more noticeable than on lower frequencies.
Click to expand...
Click to collapse
Well, that's not quite the same as what I was saying.
Different CPU frequencies use different current levels which will affect the power draw. So in this case, it will affect the battery savings. Whereas undervolting alone doesn't bring much of a difference due to the already efficient design of our SOC (well, at least in my case ).
Saber.
Undervolting -> Lower Temp -> Less Throttling -> Better Performance with slightly better battery life.
Sent from my SM-G900F using XDA Labs
Throttling is really noticeable with stock voltages. Play some games for a while and you'll start to feel that phone is getting slower and hotter. Not the case anymore after undervolting. If your phone can handle upto 0.1V undervolt, then your SOC is in good shape.
Wlld1 said:
Undervolting -> Lower Temp -> Less Throttling -> Better Performance with slightly better battery life.
Sent from my SM-G900F using XDA Labs
Click to expand...
Click to collapse
i can confirm this, i feel my phone is really snappy now and slightly worm, not hot anymore
I use 300-2000Mhz and heavy UV 620-850V. I also use "use_spi_crc=0".
After phone reboot on stock i get 80'C (cpu tem module in xposed) and on my settings it is not reaching 60'C
What about battery life? it needs long testing, i can assume that its slightly better because less energy is converted in to heat
There seems to be some misconception on undervolting.
In theory undervolting should translate to better battery life. However....
Real world results tell a different story as it shouldn't really make much difference at all. For example, not all S5 phones run the same voltage tables (different CPU quality require more/less voltage), yet they achieve the same battery life. So what voltage was set by the manufacturer (Samsung) is already the optimum voltage.
You will definitely achieve better thermals after undervolting, but in the custom kernel world, most kernel developers will not be able to provide help in the case of instabilities. Some kernel developers may not even provide undervolting support because there just isn't a great enough benefit other than improving thermals.
Saber.
What about undervolting Busses, Image processing System, MMC Memory, GPU and CPU?
I`ve got the exynos variant of the S5. I undervolted to -85 all of that stuff and the phone now doesn't heat at all and battery life isn't that amazing but it is noticeably better
Rudy1967 said:
What about undervolting Busses, Image processing System, MMC Memory, GPU and CPU?
I`ve got the exynos variant of the S5. I undervolted to -85 all of that stuff and the phone now doesn't heat at all and battery life isn't that amazing but it is noticeably better
Click to expand...
Click to collapse
I'm using the snapdragon variant with boeffla kernel so only the CPU is allowed to be undervolted.
Undervolting other components alongside the CPU will make a more noticeable difference in terms of battery savings. It still isn't recommended by many kernel devs as these other components are more sensitive to slight voltage changes (including the bus).
Saber.
Saber said:
I'm using the snapdragon variant with boeffla kernel so only the CPU is allowed to be undervolted.
Undervolting other components alongside the CPU will make a more noticeable difference in terms of battery savings. It still isn't recommended by many kernel devs as these other components are more sensitive to slight voltage changes (including the bus).
Saber.
Click to expand...
Click to collapse
Yeah it actually makes a slight difference in battery life, But I don't think anyone should go below these values since I started to get Screen of death and all that kinda stuff that happens when phones are very undervolted haha
If there's a kernel that allows users of Snapdragon phones to undervolt that hardware, I really recommend you to do it, it really helps battery's performance if you need that extra hour of Screen On time
Now, all of this changes are not recommended cause there could be problems with your phones if you're not sure bout the parameters you're playing with.
does anybody else have problem with gpu oc ? no matter what settings i use there is no performance increase at all, its like the 600Mhz is permanent even when all monitoring programs show 700-800Mhz :/ I have tested gpu many times using 3dmark - always the same fps (600-800Mhz). With 200Mhz increase in frequency it should be significant increase in fps!