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)

Post your Undervolt Settings here

Ok I did this for my Xoom and got much better battery, so I also applied this to my wife's Galaxy S2. Here we go.
Governor: Smartass2
Clock Speeds:
1400mhz - 1275
1200mhz - 1175
1000mhz - 1075
800mhz - 1025
500mhz - 850
200mhz - 800
This is where I am at so far on my settings stable. Post what you have and maybe we can find a happy medium with these chips to help battery life out for our phones and roms.
I can also upload the SetCPU saved voltage settings also if requested.

Governor: ondemand
Clock Speeds:
1400mhz - 1275
1200mhz - 1175
1000mhz - 1075
800mhz - 975
500mhz - 875
200mhz - 825
If I try to decrease the last 2 clock voltages 25mv more it crashes.

Might help if you post what kernel and ROM your currently using!
Im trying to find some nice voltages for Stock 2.3.5 and Siyah 1.7.7 kernel

I use stock rom MUGKG2 2.3.3 (Canada rom) and Ragemod U1 v1.1b kernel.
my phone sometimes crashes also but I don't care much since my battery life is very good. I achieve 20h average battery life.

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.

[Q] Perfect overclock config @ 1.2 ghz defy

Yeah am new To xda and i want to overclock my defy @ 1.2 ghz ... and whenever
i try to overclock above 1000 mhz it starts heating upto 43 degrees... plz give me the overclocking values @ stable ... and is this overheating do serious damage to phones hardware!.....! thanks

My setting :
300 Mhz / 30 Vsel
600 Mhz / 42 Vsel
800 Mhz /50 Vsel or 900 Mhz / 54 Vsel
1.0 Ghz / 58 Vsel or 1.2 Ghz / 66 Vsel
You can use this setting without any risk. 1.2 Ghz is the original value of OMAP 3630 on Droid2.
But i think you have another problem on your phone (something running) to get 43° for your battery. Mine is allways between 30° and 37° max running at 1.2 GHZ...
Note : original Defy+ settings = 300/33 ; 600/48 ; 800/58 ; 1000/68

devilthehellraiser said:
Yeah am new To xda and i want to overclock my defy @ 1.2 ghz ... and whenever
i try to overclock above 1000 mhz it starts heating upto 43 degrees... plz give me the overclocking values @ stable ... and is this overheating do serious damage to phones hardware!.....! thanks
Click to expand...
Click to collapse
300mhz @ 26Vsel
600mhz @ 38Vsel
1200 mhz @ 58 Vsel

what vsel do u use for 1ghz?
For 1.2ghz try using a low vsel and test if it works. Keep increasing it by 1 until it is stable.
For my phone the minimum it could handle wihtout crashing immediately is 56. Its pretty stable at 58 and for games or if i need more stability i try to raise it to 60-64. But it starts heating faster

i use 48 for 1 ghz its rock stable as it never crashed ...

minez - 320 at 17 ,,, 650 at 38 ,,, 1.2GHz at 60 ..... very stable

Mine is:
[email protected]
[email protected]
[email protected]
very stable and not too much heating

Mine is
22 300mhz
32 600mhz
52 1ghz
Been using them settings for many months

devilthehellraiser said:
Yeah am new To xda and i want to overclock my defy @ 1.2 ghz ... and whenever
i try to overclock above 1000 mhz it starts heating upto 43 degrees... plz give me the overclocking values @ stable ... and is this overheating do serious damage to phones hardware!.....! thanks
Click to expand...
Click to collapse
Do you really need 1.2ghz? Don't set high frecuencies if you dont need it.
Anyway, dont worry too much about temp. I'm on a hot country, and when i'm heavy using my defy, temp raises to 45C, no problem.
All android phones have automatic cooling mode when you reach critic temps. You dont have to worry about that.
Sent from my MB525 using XDA App

my settings are:
[email protected]
[email protected]
[email protected]
i could lower each setting with 2 vsel and still get a stable phone, but i increased it just in case. and yeah, you dont need 1.2GHz, 1GHz will do just fine, dont worry.

My settings are:
[email protected]
[email protected]
[email protected]
1.2ghz is awesome and what it supposed to be

Just stumbled across this thread, wanting to test 1.2ghz and was wondering what app you guys are using to monitor temperatures? is set cpu good enough?

dude i use battery xl and it displays temp in the notifications !

My settings are:
[email protected]
[email protected]
[email protected]
greetings!

Com4nd3r said:
My settings are:
[email protected]
[email protected]
[email protected]
greetings!
Click to expand...
Click to collapse
These settings seem to be the most stable ive tried so far on my defy, and temp is very cool at 27 degrees. Thanks
I do suppose it depends on your phone i had 2 zte blades and one of the them was stable at 826mhz but the other would not go above 710mhz without constant reboots
Wait until we get unlocked boot loader that is when the overclocking gets serious XD my nexus is at 1.2ghz with smartassV2 govenor and its rock stable, saying that with unlocked bootloader the potential is endless like with my xperia arc it has qualcomm snapdragon msm8255 @ 1ghz but with DooMLoRD's kernel can have a max of 1.9ghz But then again i hate my xperia arc lol

furrabbit.nh said:
These settings seem to be the most stable ive tried so far on my defy, and temp is very cool at 27 degrees. Thanks
I do suppose it depends on your phone i had 2 zte blades and one of the them was stable at 826mhz but the other would not go above 710mhz without constant reboots
Wait until we get unlocked boot loader that is when the overclocking gets serious XD my nexus is at 1.2ghz with smartassV2 govenor and its rock stable, saying that with unlocked bootloader the potential is endless like with my xperia arc it has qualcomm snapdragon msm8255 @ 1ghz but with DooMLoRD's kernel can have a max of 1.9ghz But then again i hate my xperia arc lol
Click to expand...
Click to collapse
not every cpu is identical , thats why not every phone can reach the same clock rates. To avoid damaging your cpu , its important not to set the vsel too high.
On my defy i never had it set over 65vsel.
70vsel is the max. limit so ive heard.
when yous settings are unstabile you could either clock down or set your vsel higher.

I AM USING [ROM]Android 2.3.6 - 4.5.2-109_DHT-25(mod. "spear1403")
I CHANGE A VERY FEW VALUES FROM: RECOVERY, SYSTEM, OVERLOCK. AND MY PHONE GONE SLOW, LIMPACK SHOW ME: 4 MFLOP!!!
SOME ONE TRY THIS?

1.2 GHz!!! the battery drains very fast or not?

My Defy is stable with:
vsel1: 25 vsel @ 0330 mhz
vsel2: 38 vsel @ 0800 mhz
vsel3: 51 vsel @ 1200 mhz
vsel4: 62 vsel @ 1400 mhz
The Defy of my GF crashes with these settings...
she uses:
vsel1: 31 vsel @ 0330 mhz
vsel2: 41 vsel @ 0800 mhz
vsel3: 58 vsel @ 1000 mhz
vsel4: 64 vsel @ 1200 mhz
EDIT: I need 1400 mhz to play GTAIII lagfree also lot of stuff like Skype calling / Fritz Fon / PhotoShop Express are working better on 1400 than on 1000, I don't understand why everybody says we do not need more than 1000, also the battery drain is about the vsel and not the frequency. My battery lasts loger on 62 vsel @ 1400 than on 64 vsel @ 1200

I am reading the posts in XDA about changing the default frequency of processor in DEFY as I am a beginner of CPU overclock, would like to ask for advice:
1. What is "vsel"? Is it the voltage set for the processor to run in certain frequency?
2. What is the default "vsel" for DEFY in 800MHz? I guess it is 58, right?
Correct me if I am wrong. Thanks a lot!

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.