Database Users

Undervolting Thread

This thread has been created to share Undervolting Settings (UV).
Undervolting makes CPU/GPU/Modem to consume less power, thus extend battery life. This is allowed by flashing modified kernels that allow UV (Thanks to raspdeep's work). One can use Voltage Control to change settings (Thanks to xan).
Setting format is -x mV for a given CPU clock as used in xan's app: [1200Mhz] [1000Mhz] [800Mhz] [400Mhz] [200Mhz] [100Mhz]
What are your settings?
PS: Please edit your very first post with settings instead of reposting. Thank you!

Stable: 50 50 75 100 100 100
1200 max: 50
1000 max: 50
800 max: 75

I am currently running 50 50 50 75 100 100 with no stability problems. It has made 4 back-to-back quadrant runs and a couple days of general usage without any crashes so far.

Undervolting doesn't work well with my phone the same with overclocking. I can't undervolt 1000Mhz and above because it causes much stability issues here. I can only undervolt 100-800Mhz with settings < 100mV.

TheVisitorX said:
Undervolting doesn't work well with my phone the same with overclocking. I can't undervolt 1000Mhz and above because it causes much stability issues here. I can only undervolt 100-800Mhz with settings < 100mV.
Click to expand...
Click to collapse
My system hangs in sleep mode when I have setCPU or Superpower with sidekick on.

I have the max cpu capped at 800mhz using SetCpu.
Undervolted -50 for 800mhz 600 400 200 and 100 each.Phone was at 50% last night and 6 hours later it's dead.Battery was completely discharged.All i did was set everything at 50Mvs less.Correct ? i think i'm missing something.Do help.thanks.

hey guys
im new to oc and uv
im currenlty using ramads gb jvh with hardcores speedmod kernel
ive got tegraks ultimate app and have oc'd it to 1100 as anything above reboots my phone
everything else is the same as standard
i was wondering if anyone else can help me with what i should change
i have no clue,
so far
frequency 1100
core 1275mv
internel 1100
cpu level 1
frequency 800
core 1200
internel 1100
cpu level 2
frequency 400
core 1050
internal 1100
cpu level 3
frequency 200
core 950
internal 1100
cpu level 4
frequency 100
core 950
internal 1000
these values are all stock, i havent touched them
im wanting to know what i should change them to
thanks
forgot to add, my battery life is really bad, i use hsdpa and wifi frequently

i have cm7 #19 with the (latest) glitch v10b-VC kernel..no oc, bu uv
100mhz -50,200mhz -50,400mhz -50, 800mhz -25 and 1000mhz @stock

What is the negative effects of UV?
My current values starting at 1000mhz is:
-75
-100
-100
-125
-175

hackeron said:
What is the negative effects of UV?
My current values starting at 1000mhz is:
-75
-100
-100
-125
-175
Click to expand...
Click to collapse
Negative effects come in the form of stability issues and random reboots. Is doesn't physically damage the processor. By lowering the core voltage supplied to the CPU, you also decrease the noise margin for the CPU to properly differentiate between logic 1 and logic 0. This is why -75, for example, works for some and not for others because processors are not 100% identical. The obvious benefit UV is lower power consumption.

gtda said:
hey guys
im new to oc and uv
im currenlty using ramads gb jvh with hardcores speedmod kernel
ive got tegraks ultimate app and have oc'd it to 1100 as anything above reboots my phone
everything else is the same as standard
i was wondering if anyone else can help me with what i should change
i have no clue,
so far
frequency 1100
core 1275mv
internel 1100
cpu level 1
frequency 800
core 1200
internel 1100
cpu level 2
frequency 400
core 1050
internal 1100
cpu level 3
frequency 200
core 950
internal 1100
cpu level 4
frequency 100
core 950
internal 1000
these values are all stock, i havent touched them
im wanting to know what i should change them to
thanks
forgot to add, my battery life is really bad, i use hsdpa and wifi frequently
Click to expand...
Click to collapse
I'm also using Tegrak's overclock apk for some time now (from beginning) and it's really good!
Just lower the core voltage (start with cpu level 0) until it's unstable (random reboots), then add a few mv (+5) to make it stable again (no reboots). do this for every core frequency (only one at the time, so you know witch one is making the system unstable). I never touch the internal frequency... Undervolting will NOT damage your CPU (overclocking can if you're not carefull)
Don't be stupid testing just a few hours, test (stress test) for days. Only then you are sure it's stable
These are my settings:
(rock stable after a few weeks => playing asphalt6, running quadrant and smartbench hours a day for a few weeks,...)
cpu level 0
frequency 1000
core 1205mv (-70) => could get it stable at 1200 but had one reboot after one week, so I added +5
internel 1100
cpu level 1
frequency 800
core 1105 (-95) => could get it stable at 1100 but had one reboot after one week, so I added +5
internel 1100
cpu level 2
frequency 400
core 950 (-100)
internal 1100
cpu level 3
frequency 200
core 825 (-125)
internal 1100
cpu level 4
frequency 100
core 825 (-125)
internal 1100
Now I know what my lowest core voltage is, I can start overclocking (not for now).
I'm on stock deodexed JVP 2.3.4 with Hardcore (latest) Speedmod (partition EXT4), Tegrack Overclock Ultimate and Voodoo Control Plus (holy combo => Quadrant 2400+ (no OC, just UV) and wow, what a great battery life!
edit: yes, I need to update my signature

SamHaLeKe said:
cpu level 4
frequency 100
core 825 (-125)
internal 1100
Click to expand...
Click to collapse
^ Typo??????????
internal voltage @ 100Mhz is 1000mV by default, so you are overvolting.

kiwijunglist said:
^ Typo??????????
internal voltage @ 100Mhz is 1000mV by default, so you are overvolting.
Click to expand...
Click to collapse
Default value is 950mV on my phone according to pimpmycpu. According to SamHaLeKe's post, he's reducing his by -125 so 825mV is correct
I'm new to UV, and just experimenting. My current values are
1200 = -50mV
800 = -50mV
400 = -100mV
200 = -100mV
100 = -150mV
Seems ok so far, more aggressive cutting gave me reboots

$$$

The most i could get from my phone w/o stability issues
1500 - 50
1400 - 50
1300 - 50
1200 - 50
1000 - 50
800 - 75
400 - 100
200 - 125
100 - 150

Starting from 1000MHz, I'm using these values :
-50 [1000]
-75 [800]
-100 [400]
-125 [200]
-150 [100]
No stability issues since then !

Mine are;
1000 : 50
800 : 50
400 : 75
200 : 75
100 : 100
Works great for me
Sent from my GT-I9000 using Tapatalk

swaakx said:
Starting from 1000MHz, I'm using these values :
-50 [1000]
-75 [800]
-100 [400]
-125 [200]
-150 [100]
No stability issues since then !
Click to expand...
Click to collapse
i have the same!
my phone now cold as ice. and greatly stable

I'm a noob at this UV stuff but I'm quite interesting about that.
I tried with Control Freak, should I set first a low voltage on 100Mhz and try to stress the cpu only with this change on 100MHZ? or should I set all voltages and test?
thx for help

i'm on jvq darkyrom
using tegrak overclock ultimate
1200mhz 1255 (-20)
800mhz 1105 (-95)
400mhz 950 (-100)
200mhz 850 (-100)
100mhz 810 (-140)

Undervolt settings.

Im looking for stable undervolt settings I have currently mine set at
1600 Mhz - 1400 Mv
1400 " - 1300 "
1200 " - 1250 "
1000 " - 1175 "
800 " - 1050 "
500 " 950 "
200 " - 850 "
100 " - 825 "
My settings are stable but maybe someone can put out where I can still undervolt and retaining stability.
Im using stock + Siyah Kernel.

I'm not trying to be rude, but it's a bit useless since not every devices can handle the same settings...
And of course you can still undervolt. You will find YOUR best settings when you're at the lowest values and your phone is still stable. If you're going too low, you'll have to reboot the phone and set the voltage a bit higher.
But if you want an idea, mine is running rock solid with these settings :
100MHz @ 825mV
200MHz @ 825mV
500MHz @ 850mV
800MHz @ 950mV
1000MHz @ 1050mV
1200MHz @ 1150mV
I'm also on stock KI8 + Siyah 2.0b6

Keep trying by 25mV
Siyah Kernel
Cognition 1.5.1
100Mhz @ 775mV
200Mhz @ 800mV
500Mhz @ 825mV
800Mhz @ 950mV
1000Mhz @ 1050mV
1200Mhz @ 1150mV
1400Mhz @ 1275mV
1600Mhz @ 1350mV

What exactly constitutes stable? Half an hour on a stability test? 1 hour? 2 hours? a month?

jayquinten510 said:
What exactly constitutes stable? Half an hour on a stability test? 1 hour? 2 hours? a month?
Click to expand...
Click to collapse
Stability Test is crap. Play a game for an hour to see if it's stable.

ithehappy said:
Stability Test is crap. Play a game for an hour to see if it's stable.
Click to expand...
Click to collapse
Haha, normally I would, but my HSC exams start tomorrow :/ Last school exams ever! Hopefully will get me into uni. I was just running stability tests in the background when I was studying, but maybe I will leave it till after the HSC.

skuizy said:
I'm not trying to be rude, but it's a bit useless since not every devices can handle the same settings...
And of course you can still undervolt. You will find YOUR best settings when you're at the lowest values and your phone is still stable. If you're going too low, you'll have to reboot the phone and set the voltage a bit higher.
But if you want an idea, mine is running rock solid with these settings :
100MHz @ 825mV
200MHz @ 825mV
500MHz @ 850mV
800MHz @ 950mV
1000MHz @ 1050mV
1200MHz @ 1150mV
I'm also on stock KI8 + Siyah 2.0b6
Click to expand...
Click to collapse
Good setting....i'm using without problem from 3 days.
Question:
Do you set governor from 100 to 1600mhz or standard 1200?

ithehappy said:
Stability Test is crap. Play a game for an hour to see if it's stable.
Click to expand...
Click to collapse
CPU stress test in setcpu is a goodone. USing the two cores completely for testing, most of the games make use of GPU a lot and some CPU, so playing games alone wont help you in testing the stability.

Ics stable voltages UV/OC

HI
since in ICS firmwares we can talk about different cpu voltages than gb and i think it's a hot subject mostly in kernel threads i believe i can start this thread because many are interested about this. i use speedmod kernel k3-7 and i can use only tegrak overclock ultimate to change voltages. my stable config is:
200 mhz- 825 mv
500 mhz-925 mv
800 mhz-975 mv
1000 mhz-1050 mv
1200 mhz-1150 mv
with this config i get no freeze or sod. so please post your stable config too.
new info:
-seems that i can't go below 925 mv at 500 mhz
-i will see how the battery life will go with these voltages and i will post some pictures because i am interested in undervolting for battery life.
i also saw a post in neak ics kernel where a user had 7 h and 32 minutes display time.

pissyhun said:
HI
since in ICS firmwares we can talk about different cpu voltages than gb and i think it's a hot subject mostly in kernel threads i believe i can start this thread because many are interested about this. i use speedmod kernel k3-7 and i can use only tegrak overclock ultimate to change voltages. my stable config is:
200 mhz- 825 mv
500 mhz-925 mv
800 mhz-975 mv
1000 mhz-1050 mv
1200 mhz-1125 mv
with this config i get no freeze or sod. so please post your stable config too.
Click to expand...
Click to collapse
What were your gb values?
Sent from my GT-I9100 using Tapatalk

Yes, I don't see the values changing with ICS.

I should pay some more time on it... 825mV for 200MHz so amazing

hi
it seems if i go down 925 mV for 500 mhz i got freeze.

Hrithan2020 said:
What were your gb values?
Sent from my GT-I9100 using Tapatalk
Click to expand...
Click to collapse
hi
theese were my values in gb roms:
1200mhz - 1150mv (stock = 1250mv)
1000mhz - 1050mv (stock = 1150mv)
800mhz - 950mv (stock = 1050mv)
500mhz - 875mv (stock = 975mv)
200mhz - 850mv (stock = 975mv)
and i used phenomenal 4.0 extreme without freeze or sod.
my phone was produced in octomber 2011.

pissyhun said:
hi
theese were my values in gb roms:
1200mhz - 1150mv (stock = 1250mv)
1000mhz - 1050mv (stock = 1150mv)
800mhz - 950mv (stock = 1050mv)
500mhz - 875mv (stock = 975mv)
200mhz - 850mv (stock = 975mv)
and i used phenomenal 4.0 extreme without freeze or sod.
my phone was produced in octomber 2011.
Click to expand...
Click to collapse
Strange.. Are you sure, that you had set the lowest possible values for GB?
For me, it looks as if I would have to increase the voltages a bit in ICS.
Haven't looked too much into it.. [running CM9 with Siyah rc3.. both beta.. need work]

GB voltage:
1200 MHz - 1150 mv
1000 MHz - 1050 mv
800 MHz - 950 mv
500 MHz - 850 mv
200 MHz - 800 mv
Always stable for me. I always use this voltage settings until I update my phone into ICS.
ICS voltage:
1200 MHz - 1150 mv
1000 MHz - 1050 mv
800 MHz - 950 mv
500 MHz - 925 mv
200 MHz - 800 mv
It seems I can't set the voltage for 500 MHz lower anymore. Otherwise the phone will freeze.
Sent from my GT-I9100 using xda premium

so far so good.
they seem to be working for me as well.
using Siyah latest kernel and Hydrog3n rom.

hi
some users reported theese voltages to be stable:
200-800 mv
500 - 925 mv
800 - 950 mv
1000 - 1050 mv
1200 - 1125 mV

pissyhun said:
hi
it seems if i go down 925 mV for 500 mhz i got freeze.
Click to expand...
Click to collapse
Hahaha, Are you really sure ?
Who dares trying my extreme UV​ values ?​
My UV stable table (Mhz/mA) :
1200 (1125) | 1000 (1025) | 800 (950) | 500 (900) | 200 (800) | 100 (800)
Noop + On demand.
Thanks to NEAK for its magic on my S2

Hi
Changed kernel-neak and i use now
850 900 950 1025 1125 mv
Sent from my GT-I9100 using XDA

well this are my settings:
Min/max: 100 mHz-1200mHz
vr - smartassV2
100 - 825
200 - 875
500 - 925
800 - 975
1000 - 1050
1200 - 1150
Siyah 3.0
i tryied to go a lil bit under this settings, but then i had some freezes. i think 500 and 800 makes the most problems.

on ics i have to pull up a bit the voltages that were stable for me on gb, but the annoying thing is that i can´t go less than 925mv for 500mhz step, i get freezes and on gb i was on 875

I'm running 200Mhz 775mV stable
800Mhz 925mV
But cant get stable at 1600Mhz, I get freeze on anything between 1325-1500mV
Anyone can?

This thread is kind of useless .. every phone supports different UV !
Sent from my GT-I9100 using xda premium

I dont think so
Sent from my GT-I9100 using XDA

i am confused cause all tht magic an other tweaks really dint work for me,i tried all but sometimes the phone runs jus for few mins and right now my phone is fully loaded like 400+apps an iam downloading more day by day too check how much sgs2 will handle.an yes i think every phone is diff...

Jodelaplaya said:
This thread is kind of useless .. every phone supports different UV !
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
pissyhun said:
I dont think so
Sent from my GT-I9100 using XDA
Click to expand...
Click to collapse
Well, each phone has different tolerance to Undervolting. I for example can not go lower then these values:
200MHz - 900/925mV
500MHz - 950/975mV
800MHz - 1050mV
1000MHz - 1100-1150mV
1200MHz - 1250mV
If I go lower then 1250mV for 1200MHz, I will get freezes (if not instant then when browsing the net or something heavy). As you can see my values are not so "extreme", other people can undervolt much more.
There has been one succesfull thread of this type from Geko, it's called MagicConifg (if you click on Undervolting in my signature you will be taken there). He tested for months which UV settings would work for 99% of the people. I was one of the few people that couldn't handle his config
Anyway, I don't say that this thread is totally useless. Discussing UV settings can be helpfull for others which are new to Undervolting. But for me the UV settings have stayed the same as on GB, don't know if it's so different UV'ing on GB and on ICS.
As long as people realise: the settings that work for somebody may not work on your own phone! A lot of people in this thread undervolt heavy and there is a big chance your own phone will freeze (and if you set it on boot and can't remove them anymore, that means reflashing your rom...). So be carefull

Cm9 rom/kernal
200 @ not used
500 @ 825 mV
800 @ 950 mV
1000 @ 1050 mV
1200 @ 1150 mV

Undervolting discussion

I have read very conflicting things about undervolting; some say it doesn't do much at all, others say it's worth the effort. What most can agree on though, is that it depends on the phone, so I want to get some input to see if people have had success with it on the Fascinate. I tried a mild undervolt today and while I didn't notice much change with the screen on (while using it) I did notice it held a lot better charge while in stand-by. My settings as of right now are:
1200 MHz - 1300mV (-50)
1000 MHz - 1225mV (-50)
800 MHz - 1150mV (-50)
400 MHz - 950mV (-100)
200 MHz - 850mV (-100)
100 MHz - 850mV (-100)

I have been running the over / under volts for a while on different test builds with really good results...
I did do a live o/c for a while but have settled on normal o/c
My over / under settings as of right now are:
1200 mhz O/C
100 mhz minimum
1200 MHz - 1400mV (+50)
1000 MHz - 1325mV (+50)
800 MHz - 1250mV (+50)
400 MHz - 1025mV (-25)
200 MHz - 900mV (-50)
100 MHz - 875mV (-75)
------------------------
------------------------
But i have been wanting to test some other stuff too
I figured i would test this::
And see how it runs
1200 MHz - 1350mV (+00)
1000 MHz - 1275mV (+00)
800 MHz - 1200mV (+00)
400 MHz - 1000mV (-50)
200 MHz - 850mV (-100)
100 MHz - 850mV (-100)
sent from my swagger
aokp 10/22 test / devil kernel

Just curious, but what was your reasoning to raise the voltage? It seems like that would just be a battery drain because at those steps the stock voltage should be more than enough for stability.
I also don't Live OC but that's only because my phone will crash at 110% Live OC so I don't see the point in doing 105% Live OC... so I just do what you do and have 1200 MHz regular OC now

Crawshayi said:
Just curious, but what was your reasoning to raise the voltage? It seems like that would just be a battery drain because at those steps the stock voltage should be more than enough for stability.
I also don't Live OC but that's only because my phone will crash at 110% Live OC so I don't see the point in doing 105% Live OC... so I just do what you do and have 1200 MHz regular OC now
Click to expand...
Click to collapse
Just came from all the reading in the original devil ics thread...
Somebody 'Crack' ran these settings...
http://forum.xda-developers.com/showthread.php?t=1699141
It has so many great answers and Such great info,,, just realized i need to go back and read some more,,,
Think ... devil idle .... :thumbup:
sent from my swagger
aokp 10/22 test / devil kernel

From all the roms/kernels I ever ran on my fascinate undervolting did help slightly. It seems if I remember correctly that pulling -50uv across the board helped with battery life without decreasing stability. Anymore than that is when the random reboots started. Also disabling the 100mhz step made a big difference with SOD's and reboots.

Crawshayi said:
Just curious, but what was your reasoning to raise the voltage? It seems like that would just be a battery drain because at those steps the stock voltage should be more than enough for stability.
I also don't Live OC but that's only because my phone will crash at 110% Live OC so I don't see the point in doing 105% Live OC... so I just do what you do and have 1200 MHz regular OC now
Click to expand...
Click to collapse
You can do both a live oc (fsb overclock), and a regular overclock (multiplier overclock) at the same time. I use 110 live oc and a 200 mhz regular overclock giving me a total of 1320mhz. Set your live oc then use rom controlor whatever to do your regular overclock on top of it.

Post your performance settings (OC/OV/LiveOC...)

Hello SGS-owners!
I think this thread will be useful for everyone who wants to increase performance on i9000 (and variants).
We will discuss about it and compare our settings.
So please specify:
- Your phone model;
- ROM;
- Kernel;
- CPU frequencies (min, max)
- Live OC
- Voltages
- Other tweaks you did
I'll be the first:
[Edit 18 Nov. 2012]
- GT-i9000
- Cyanogenmod 10.0
- Mackay Kernel 0.99
- CPU 100 MHz - 1300 MHz
- Stock live OC
- Stock voltages
- Deep idle
- Governor: Smartass V2
- Scheduler: CFQ
Here you are, now post yours!

- GT-i9001
- Cyanogenmod 10(DoomNexus V3)
- 3.0.48 by camcory
- CPU 368 MHz - 1401 MHz
- Stock voltages
- Governor: Interactive
- Scheduler: Noop