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[GUIDE] Make your own undervolt (GB + ICS)

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By eric-filth, Senior Member on 6th March 2012, 07:39 AM
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- What is UNDERVOLT
- Benefits of UNDERVOLT
- Standard Voltages
- Software needed
- Procedures and how to test
- Side Effects
- Results

What is UNDERVOLT (UV)

It's very simple meaning, the translation itself says it "under voltage".
UNDERVOLT is you decrease the voltage pattern of the manufacturer. But you may be wondering. Voltage of what? What we can decrease via software are: processor voltage which is divided into (core voltage and internal voltage) and decrease the voltage of the video card. There are other voltages via the kernel but only among some of them, ram voltage and voltage of the screen. But here we deal only with CPU and GPU.

Undervolting on ICS

The procedure is exactly the same. Programs for testing and process are the same too. With just a detail specifically.

- After many fought discovered that the voltage supported for Ginger can be used in IceCream with just a detail. STEP Clock 500mhz. I do not know why but it's no use simply use less frequently than 925mV that will hang. Then start by this voltage.

- Another important detail is that we do not have undervolt on "internal voltage" only on "core voltage"

Benefits UNDERVOLT

Simple, fast and direct; conserve battery power. Give more time to use on our mobile without having to reload.


Voltage pattern

This voltage is determined by the standard kernel. I'll put here the voltages of the stock kernel, custom kernel but each uses a different voltage from one another but that does not interfere with anything in our procedure.
I'll try to explain a little more how it works. This voltage to which I refer is measured in mV (millivolts). And each step (frequency) of the processor or video card possesses a voltage. Up link because it would not use a high voltage is used with the processor 1.200mhz be used with the processor at 200 MHz for example.

Standard voltages of the processor:

1.200mhz - 1.250mV 1.100mV internal core voltage and voltage
1.000mhz - 1.150mV 1.100mV internal core voltage and voltage
800mhz - 1.050mV 1.100mV internal core voltage and voltage
500mhz - 950mV 1.000mV internal core voltage and voltage
200MHz - 900mV 1.000mV internal core voltage and voltage

Standard voltage of the video card:

267mhz - 1.000mV
160MHz - 950mV

Programs needed:

Undervolting:
There are three most commonly used today
- Tegrak Overclock Ultimate * paid
- Voltage Control * free and paid
- SetCPU paid *

Each of these has its special qualities cited I quote the principal.

Tegrak: one who can do UNDERVOLT kernel in stock and only one who can do UNDERVOLT the internal voltage.
Voltage Control: the interface is more user friendly and compatible with most custom kernel.
SetCPU: was or still is the most popular but today there are better and does not work right UNDERVOLT on the video card.

For the tests:

- 2nd Core (enables the use of the second core constant)
- Super PI
- Linpack
- A video about 5min
- Antutu, quadrant, nenamark2
- NEAK CPU Stress Test *new

I will leave here already written about how to use them when I quote them in part of the procedure does not have to explain.

Super PI: he runs the option 512kb, which is longer but it uses calculations is a good way.
Linpack: perhaps the most sensitive UNDERVOLT I know. Click several times in multi-thread around a 20 to 30 times.
Quadrant, Antutu and Nenamark2: they are not very sensitive to UNDERVOLT, sometimes you run three times and it does not crash but hangs running the Linpack test but they UNDERVOLT video card.
Video: never tested particularly well, but has a staff recommends that the xda that way.
Neak Stress Test: just click in Start StressTest and wait 2 minutes.


Procedures and Form of testing

1st step: with 2nd Core App enabled two core always

2nd step: choose what you want to test. If the processor or video card. No matter what the procedure is the same.

Step 3: in what you choose (processor or video card) you have to go by parts and if choosing a lot of different voltages because otherwise if you do not know where to catch the problem was. I will explain in detail how to and have done the process.
If you chose to start with the processor. In this case opting for the core voltage.
For a UNDERVOLT efficient and successful you must EVER use maximum frequency and minimum frequency = you use this form for all frequencies tested.
Simply put, your seven 200MHz processor (both maximum and the minimum) and a voltage just choose the frequency that we use in the case is 200MHz. I recommend starting by choosing from more aggressive to the nearest standard. I say this because it is good to know what is the most aggressive right from the begining that after staying in doubt whether or not hold out that much voltage. Start trying to put 850mV for 200MHz. Below 850mV only Tegrak Ultimate and Extreme Voltage Control. Once you set and has fought better because not waste time testing. +25 Choosing start again only the last selected voltage. Always after crahsed i recommend increase +25 for morenprecision.If it worked to get the battery of tests as explained in the "required programs" and beyond the specific tests you'd better get moving on the phone as if you were using on a daily basis to see only crashes.
After you have found a value (mV) to 200MHz you can already go to the frequency of 500mhz and 500mhz repeated by setting maximum and minimum. This procedure will be used for all testing so from now on I'll just give tips on values ​​to be used it may be that people who have never seen it before not knowing where or by voltage (mV) choose. Quote values ​​that are already below the maximum that can support values ​​below that have never seen anyone get so I'm saving time for you.
500mhz - try starting with 850mV
Perform all tests and follow.
800mhz - try starting with 900mV
Perform all tests and follow.
1.000mhz - try starting with 1000mV
Perform all tests and follow.
1.200mhz - try starting with 1.100mV

*this voltage what i recommend was extremely low, lower values is crazy. If you dont want start with extreme undervolt i recommend start all with values above with more 50mV

After you have performed all the tests and have found the best voltage to each of you can already start to test the video card.
As the process of the video card is the same used in the processor and you must be tired of testing will resume.

Set maximum frequency = minimum frequency

267mhz - start with 900mV
160MHz - start with 800mV

Step 4: After you have set all your voltages at their respective frequencies of both the processor and video card. You can set back their frequency and maximum frequency of at least according to his need. Default values:
Processor: 200MHz - 1.200mhz
Video: 160MHz - 267mhz

5th step: Perform all possible tests with it all set up for you. And see if it's stable. If locks, will be difficult to identify where the problem was so important to give a great attention when they are testing each setting its own.


Side Effects

There are two very distinct. One is the freeze and the other is SOD (Sleep of Death) which is when the cell no longer responds after he entered into deep sleep, having to restart the phone.
Cause it may be some factors. Some devices simply do not like UNDERVOLT, another reason is the more likely you used a voltage more than it should. And another cause is that your kernel + rom + app UNDERVOLT not done well. Sometimes replacing any items solves the problem.

Eric's Undervolting Settings for ICS

Who don't want find your own undervolt.

200mhz (875mV)
500mhz (950mV)
800mhz (1025mV)
1000mhz (1100mV)
1200mhz (1200mV)

Result

One goal of this topic is exactly the result. Any testing, evaluation that shows the benefit of UNDERVOLT is welcome.
And you find your own configuration that is much more efficient than picking up some numbers of the other settings thereby obtaining a better result. This is not a "MAGIC" this is REAL.

Show your.


*** Important to read before you do.
I am not responsible for any damage that may occur on your mobile. My UNDERVOLT was done exactly as written above. I've never seen the reports and facts that this process has damaged some mobile.

If this tutorial helped you give something a simple thank you.
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6th March 2012, 07:46 AM |#2  
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i will update here to undervolt our galaxy s3
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6th March 2012, 08:22 AM |#3  
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Thumbs up
Great work Eric A very useful reference.
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6th March 2012, 08:25 AM |#4  
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Quote:
Originally Posted by MistahBungle

Great work Eric A very useful reference.

Thanks my friend. I stay glad read your post.
My only problem is i dont know perfect english so is difficult to me express really want to say.

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6th March 2012, 08:28 AM |#5  
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Great info mate.

Don't loose sleep over the whole "magic" thing.

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6th March 2012, 08:36 AM |#6  
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Your english is fine mate This guide will be a fantastic reference for people new to undervolting their phones.

Quote:
Originally Posted by eric-filth

Thanks my friend. I stay glad read your post.
My only problem is i dont know perfect english so is difficult to me express really want to say.

Sent from my GT-I9100 using Tapatalk

6th March 2012, 08:39 AM |#7  
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Great work Eric A very useful reference.
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6th March 2012, 08:39 AM |#8  
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Quote:
Originally Posted by MistahBungle

Your english is fine mate This guide will be a fantastic reference for people new to undervolting their phones.

Thanks. But i need try better my english
So this is my only reason to create this thread, try to help people make your own undervolt with best values.

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6th March 2012, 08:42 AM |#9  
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Quote:
Originally Posted by Jimmykwliu

Great work Eric A very useful reference.

Thanks for your post.
I will try to sleep now. This thread cost about 5 hours to be wrote

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Stifler69
6th March 2012, 08:56 AM |#10  
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Quote:
Originally Posted by eric-filth

Thanks for your post.
I will try to sleep now. This thread cost about 5 hours to be wrote

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mate..well done for the thread. one your english is fine i agree with MistahBungle and second this makes it even more clearer to a lot of users out there who are just starting regarding the pros and the cons of undervolting. well done
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6th March 2012, 09:31 AM |#11  
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Thanks man, getting today my S2, this will come in handy!
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