Has anyone underclocked their Galaxy S? I personally think that overclock is a bit of a placebo effect so I just want to know if anyone has underclocked their phone and if they can kindly share the performance of the phone as well as some benchmarks.
I've seen SGS2 underclocked right down to 500mhz and still running smooth but is that due to the efficiently of the Cortex A9 or because it's dual core?
Feel free to share your experiences and benchmarks.
Notorious544d said:
Has anyone underclocked their Galaxy S? I personally think that overclock is a bit of a placebo effect so I just want to know if anyone has underclocked their phone and if they can kindly share the performance of the phone as well as some benchmarks.
I've seen SGS2 underclocked right down to 500mhz and still running smooth but is that due to the efficiently of the Cortex A9 or because it's dual core?
Feel free to share your experiences and benchmarks.
Click to expand...
Click to collapse
I think we may achive smooth performance with some minor glitch at 800MHz and some minor improvement in battery.
But i dont see a point in underclocking,1GHz is just perfect for galaxy s.Moreover whats the point of buying so costly device and then underclock it???
Sent from my GT-I9000 using XDA App
Lol i underclocked mine to 100 mhz but it dont run good at all. Ur phone is not running a gig all the time if it did ud loose use up ur battery in like 4 hours, it goes from 100 to 1000 mhz whenever it needs it, you can potentially set it to 400 and it will function but the battery saving wouldnt be that much, i think the screen takes at least half of your battery, since my phone on standby can do like two to three days and i can also kill it in 4 hours playing a game or using gps or surfing the web if anything underclock ( they call it undervolt) to 800 mhz and you will barely notice, your score on the benchmark is affected because most phones gpu is directly controlled by the cpu so undervolting will affect your fps which will give you laggy games or crappy benchmark scores
Sent from my GT-I9000 using xda premium
Stock is best try miui it runs really smooth on sgs
Sent from my GT-I9000 using xda premium
I actually Overclock it to 1.2..
I overclocked it to 1.2 and undervolt the from 800-1.2 -50mV
it was stable.. but then i undervolt -100mV from 100-200Mhz and my SGS crahsed..
I use semaphore 1.3.3... lol any idea what settings i should use ? xD
B-Ace said:
I overclocked it to 1.2 and undervolt the from 800-1.2 -50mV
it was stable.. but then i undervolt -100mV from 100-200Mhz and my SGS crahsed..
I use semaphore 1.3.3... lol any idea what settings i should use ? xD
Click to expand...
Click to collapse
UV in 25mV steps. Don't just try UV'ing 100mV straight away.
Related
Will it damage my processor? I wanna use it but I don't wanna kill my phone!
Sent from my Desire HD using XDA Premium App
No, it won't kill your phone but it will drain your battery freaking fast...
Yeah, prolonged overclocking will build heat and may damage your phone. And why do you want to overclock up to 1.9GHz anyway? There's no performance boost after 1.6GHz afaik.
Edit: maximum performance I get is around 1.5 - 1.6GHz average over repeated benchmark of different software.
I got my Virtuous finally at 1.7 GHz (yeah!) and team the Quadrant Benchmark and gained about 200 points more, but I got to agree: there is no performance boost which you can see without benchmarking.
So I will put it back to 1.5, that's enough.
Edit: WTF? I've put it back to 1.5 and got 100 more points than with 1.7?!
If any of you have OCed/UVed the GPU of the note, I'd really like to know your settings.
Right now I only have lock on 267mhz with -100mah. I'm a afraid to push further because I haven't seen people that pushed the GPU more. It was always about CPU.
flash abyss note kernel it has built in overclock of gpu
160mhz--950mv
267mhz--1000mv
300mhz--1100mv
you dont need to overclock it then previousely it had 400mhz step instead of 300 but it makes fone quite hot while playing games and if you want to overclock gpu without flashin your kenel or remainin at your kernel m assuming u dont have the abyss note then you can try voltage control extreme or tegrak but they will not have the 300 mhz step from 267 to 400 mhz directly. ..
enjoy the great work of great devs
dreamankit said:
flash abyss note kernel it has built in overclock of gpu
160mhz--950mv
267mhz--1000mv
300mhz--1100mv
you dont need to overclock it then previousely it had 400mhz step instead of 300 but it makes fone quite hot while playing games and if you want to overclock gpu without flashin your kenel or remainin at your kernel m assuming u dont have the abyss note then you can try voltage control extreme or tegrak but they will not have the 300 mhz step from 267 to 400 mhz directly. ..
enjoy the great work of great devs
Click to expand...
Click to collapse
I already know about abyss settings.
Anyway, I'm building for best battery life / performance. So I flashed Speedmod on Rocketrom. While overclocked to 1600mhz - 1300mah with 500mhz -800mah as lowest possible cpu power.
I think I'll try out 300mhz on GPU. How hot was 400mhz?
EDIT;
I can't seem to get 300mhz on tegrak. That sucks. Is 400mhz safe at all? I mean, I can understand it being hot but is it safe?
clairenix said:
I already know about abyss settings.
Anyway, I'm building for best battery life / performance. So I flashed Speedmod on Rocketrom. While overclocked to 1600mhz - 1300mah with 500mhz -800mah as lowest possible cpu power.
I think I'll try out 300mhz on GPU. How hot was 400mhz?
EDIT;
I can't seem to get 300mhz on tegrak. That sucks. Is 400mhz safe at all? I mean, I can understand it being hot but is it safe?
Click to expand...
Click to collapse
been running for 400mhz 1050mv for a week now..
make sure u dont uv gpu so much as my screen flicker when i try 1000mv at 400mhz b4.
nameejokerx said:
been running for 400mhz 1050mv for a week now..
make sure u dont uv gpu so much as my screen flicker when i try 1000mv at 400mhz b4.
Click to expand...
Click to collapse
Nice, anyway. Is that lock on 400mhz? or not?
if not, are you on 267-400mhz?
setcpu does GPU oC/uv ? or do we have to use tegrak ? any issues if we use them both togather ?
@ clairenix
was little but not too much as you cant even touch but it eats up a lot battery if u not uv it .. while i been using rocket v22 with 3.7 abyss my battery is like m using some nokia fone its hell lot superb than ever before however i feel that rocket v21 together wid abyss 3.6 or 3.7 also gives best battery with superb performance and again its up to you but i feel abyss note has better battery life and hell lot better performance than speedmod
@hackerboi no dude as much i know set cpu does not perform gpu oc or uv nothing wid gpu only cpu oc uv profiles and governors .... how ever tegrak does all same ++ it can also oc/uv cpu but it has only 400mhz step after 267 nothing in between
no issues using together but y would u use both together ..i like tegrak more and voltage control extreme the most the app for oc or uv cpu and gpu
I'm already using SetCPU and have undervolted quite a bit. I want an app to play with the GPU settings
im running abyss 3.6c on performance at 1.4ghz no UV and i clear 20 hours a day easy on battery life, darkyrom 3.1 and i do use my phone thats not idle time
im at 18 hours right now with 28% battery left still.
JamieD81 said:
im running abyss 3.6c on performance at 1.4ghz no UV and i clear 20 hours a day easy on battery life, darkyrom 3.1 and i do use my phone thats not idle time
im at 18 hours right now with 28% battery left still.
Click to expand...
Click to collapse
After more mods I just cleared about 10+ hours on dataplan browsing non-stop and games on the side @ 500mhz-1700mhz @ full brightness while using Rocketrom v22 + abyss 3.7. That says alot about performance/battery life you could get with enough fidling around.
That's pretty much enough for what I need but I wanted to experiment since I read that speedmod consumes less battery.
I gave up with gpu undervolting and speedmod for now. Since I don't have time for stress testing.
@ HACKERBOI try tegrak ultimate or voltage control
clairenix said:
I already know about abyss settings.
Anyway, I'm building for best battery life / performance. So I flashed Speedmod on Rocketrom. While overclocked to 1600mhz - 1300mah with 500mhz -800mah as lowest possible cpu power.
I think I'll try out 300mhz on GPU. How hot was 400mhz?
EDIT;
I can't seem to get 300mhz on tegrak. That sucks. Is 400mhz safe at all? I mean, I can understand it being hot but is it safe?
Click to expand...
Click to collapse
Rocket Rom 22, Abyss 3.5c/3.6/3.7/3.8 stable and locked GPU at 267 MHz, 800 mV with Tegrak. Heat with 400 MHz at 1000 mV.
i want to know if its safe to overclock my samsung vibrant to 1200 mhz. will doing that shorten the life of my phone in any way.
tinye99 said:
i want to know if its safe to overclock my samsung vibrant to 1200 mhz. will doing that shorten the life of my phone in any way.
Click to expand...
Click to collapse
It will definitely shorten the life of the battery. As for the phone itself I can't really say. I used to use my vibrant @ 1200mhz daily while running bionix 1.3.1. I never really noticed any wear and tear from the overclocking. If your phone runs warm while overclocking you should really consider running the stock voltages. Your phone may overheat and fry your cpu gpu with the high temperatures. So be careful when overclocking.
Meh i dont completely agree...
It will only shorter the life of your battery because the processor will draw about 20% more power which is very small compared to the like 20x more power the lcd takes up.. i dont think youll feel the difference.
The heating up i disagree with too since ive seen processors reach boiling point of water and continue to work.. thats not to say they all will but ive oced my phone to 1.6ghz to benchmark for several minutes and it never got above 41*... the battery heats up alot more when its charging than the processor does most of the time so i wouldnt worry tooo much about that.
Now as to whether the phones llife will lower... yes probably.. youre putting more stress on the processor than if you dont oc.. honestly tho, processors dont die very often so i oc all day as my daily runner, usually to 1.4ghz if my kernel will do it..
Up to you and honestly all of this is my opinion based on my available info etc.. hope this helps
sent from the xda app on my android smartphone.
I have mine Oc to 1.5 and no issues. 1.5 is the Max I would go.
Sent from my SGH-T959 using xda premium
Everything I have read says 1200 is completely safe. I run mine at 1460 with no issues. It obviously draws more battery but using Voltage control app you can adjust the level of battery.
Sent from my SGH-T959 using xda premium
You would be fine with 1.2Ghz, but look into a kernel that supports some slick CPU scalers (smartass is a good, easy choice). You can set that (1.2Ghz) as a max clock and you can let the scaler determine how it gets there (if need be). Running only 2 clocks (OC and deep sleep) seems a bit overkill to me, but to each their own.
Like everyone else said, you ought to be perfectly fine with that value.
The highest I would go is 1500 though
kaiser_bun said:
You would be fine with 1.2Ghz, but look into a kernel that supports some slick CPU scalers (smartass is a good, easy choice). You can set that (1.2Ghz) as a max clock and you can let the scaler determine how it gets there (if need be). Running only 2 clocks (OC and deep sleep) seems a bit overkill to me, but to each their own.
Click to expand...
Click to collapse
Lol, running an overclock on a phone seems a bit overkill to me...
Think about this.. How much copper is strapped up to your phones cpu?
Would you overclock your desktop on a stock cooler?
I feel sorry for the saps who buy phones second hand(especially after reading this thread). (hey wait a minute, that's me too.. Lol)
I never overclock anything.
Ever.
(learned my lesson with an amd Duron 733 back in the day)
Sent from my SGH-T959 using XDA
Hello guys. I just want to take information that there are many tweaks to overclock galaxy s3 to max 1.8 ghz. If we set to maximum overclocking then is there any risk for damage hardware? Because 2 months before i had nokia n8 & i set this device to overclock & it damaged all board,now its totally destroyed. According to my point of view,sometime i think that nokia n8 has only 680 ghz & due to overclock it run on higher clock speed & so that due to low processor it could not manage or handle the higher clock speed & it ran on heavy clock speed continuesly then overload of processor it got damaged. It is my fear for s3. And i think for s3 that it has higher processor with 1.4 ghz,if i set it to 1.8 ghz then there is no risk bcoz of there are cpu governor. With this,the s3 does not run continues on 1.8 ghz higher speed, governor takes control over the cpu to run on higher clock speed according to their high usage like 200 ghz, 500ghz, 800 ghz, 1.4ghz & so on. So i think i can overclock my galaxy s3 with kernel but I'm still confused & I'm not expert. So plz suggest me to do overclock without any damage fear. Thanx a lot.
If you don't know what you are doing, then don't do it!
Sent from my GT-I9300 using xda app-developers app
sfjuocekr said:
If you don't know what you are doing, then don't do it!
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
If i don't but you know then u can tell me about any risk.
NOTHING is without risk, but a good place to start is just to install the latest Siyah S3 Kernel and run it it at 1.6ghz for the CPU and default settings for the GPU. I tried running my CPU at 1.7 and 1.8 and the it wasn't 100% stable and the temps were to high for my liking. Be moderate in your settings and you shouln't encounter any issues.
http://www.gokhanmoral.com/ latest version is 1.7rc1
That will give you a good performance bump with the minimum of risk (in my opinion).
Other than that installing a bloatware free ROM will also give a nice bump. I personally run Omega V29 with the above 1.6 overclock settings and it lightning fast. :good:
There is always a risk involved in overclocking.
1.8ghz isn't stable for most people but 1.7 is quite stable.
How well your device handles overclocking depends on the quality of the chip you got.
This is down to the manufacturing process, you may get a good chip from the middle of the wafer or a not so good one from nearer the edge.
if you want to reduce heat them you should undervolt the CPU, less current means less heat.
Obviously it isn't good for the hardware in the long run but that's what you gotta take into account when you overclock, I've overclocked every phone I've ever had and haven't had any problems but YMMV.
Sent from my Nexus 7 using xda premium
nodstuff said:
There is always a risk involved in overclocking.
1.8ghz isn't stable for most people but 1.7 is quite stable.
How well your device handles overclocking depends on the quality of the chip you got.
This is down to the manufacturing process, you may get a good chip from the middle of the wafer or a not so good one from nearer the edge.
if you want to reduce heat them you should undervolt the CPU, less current means less heat.
Obviously it isn't good for the hardware in the long run but that's what you gotta take into account when you overclock, I've overclocked every phone I've ever had and haven't had any problems but YMMV.
Sent from my Nexus 7 using xda premium
Click to expand...
Click to collapse
could u plz tell me that what is the process of undervolt if i undervolt the cpu then it is related to only heat or performence also?
If you use siyah kernel then in the stweaks app that comes with it you can choose how much you want to undervolt.
I suggest starting with -25mv or -50mv and check stability.
I use -100mv without problems but like in said earlier YMMV.
It doesn't give a performance boost per se, but less heat in the chip will mean that it doesn't hit the temperature throttle threshold as easily and that means more performance.
The CPU will begin to throttle (limit clock speed) at around 75c until the temp drops and the CPU is allowed to run at max clock speed again.
Usually you will only hit the temp throttle threshold under very heavy loads, for example repeated benchmarks.
Sent from my GT-I9300 using xda premium
mrjoy said:
Hello guys. I just want to take information that there are many tweaks to overclock galaxy s3 to max 1.8 ghz. If we set to maximum overclocking then is there any risk for damage hardware? Because 2 months before i had nokia n8 & i set this device to overclock & it damaged all board,now its totally destroyed. According to my point of view,sometime i think that nokia n8 has only 680 ghz & due to overclock it run on higher clock speed & so that due to low processor it could not manage or handle the higher clock speed & it ran on heavy clock speed continuesly then overload of processor it got damaged. It is my fear for s3. And i think for s3 that it has higher processor with 1.4 ghz,if i set it to 1.8 ghz then there is no risk bcoz of there are cpu governor. With this,the s3 does not run continues on 1.8 ghz higher speed, governor takes control over the cpu to run on higher clock speed according to their high usage like 200 ghz, 500ghz, 800 ghz, 1.4ghz & so on. So i think i can overclock my galaxy s3 with kernel but I'm still confused & I'm not expert. So plz suggest me to do overclock without any damage fear. Thanx a lot.
Click to expand...
Click to collapse
1.7ghz should be alright for a 32nm chip like the exynos 4412 on our s3. HTC has had their One S (with a 45 nm chip) clocked at 1.7 ghz. The lower the nanoneter, the more ambitious you can be with clock speeds. Try 1.6 or 1.7 ghz with default voltage settings and see how that goes
Sent from my GT-I9300 using Tapatalk 2
nodstuff said:
If you use siyah kernel then in the stweaks app that comes with it you can choose how much you want to undervolt.
I suggest starting with -25mv or -50mv and check stability.
I use -100mv without problems but like in said earlier YMMV.
It doesn't give a performance boost per se, but less heat in the chip will mean that it doesn't hit the temperature throttle threshold as easily and that means more performance.
The CPU will begin to throttle (limit clock speed) at around 75c until the temp drops and the CPU is allowed to run at max clock speed again.
Usually you will only hit the temp throttle threshold under very heavy loads, for example repeated benchmarks.
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
You are using -100 undervolt, that mean its high current & mean if i select 25 to 50 then its less current than 100??? & is there any battery improvement if i select less current mean less heat.?
I am using -100mv, as in minus 100mv, 100mv less than stock.
Less current is less heat and *maybe* battery savings.
-100mv is less current than -50mv.
Sent from my GT-I9300 using xda premium
nodstuff said:
I am using -100mv, as in minus 100mv, 100mv less than stock.
Less current is less heat and *maybe* battery savings.
-100mv is less current than -50mv.
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
I am new to all this just one question, will over clocking drain the battery quicker?
andmax66 said:
I am new to all this just one question, will over clocking drain the battery quicker?
Click to expand...
Click to collapse
Yes atleast while it's using the higher clock speeds.
Sent from my GT-I9300 using xda premium
What's a good kernel for overclocking for the stock I9300 running ICS (don't have the JB yet)? Will the latest Siyah work?
DenethorLenwion said:
What's a good kernel for overclocking for the stock I9300 running ICS (don't have the JB yet)? Will the latest Siyah work?
Click to expand...
Click to collapse
siyah, its most beginner friendly wih stweaks (for ICS you should check 1.5 version if its still obtainable, however should be)
Sent from my GT-I9300 using xda app-developers app
Antutu and Quadrant, all are just bull****. Just to see their manipulated scores, overclocking does not make any sense.
At ground level, applications do not run anything faster as overclocking alone does not work here. Even if you get milli milli milli second improvement which is just nothing against damage of CPU.
Got it?? now start using your phone as it should be and made for.
Before overclocking you should ask yourself Why you want to overclock. If it's because the phone have some lags there is other(safer) way to solve this problem. Honestly I overclock mine for a while (just because I'm a tester) but the S3 is fast enough for everything. You should see my S3. The app drawer appears (almost) instantaneously. Any games play smoothly etc...
On this phone overclocking is possible but useless. If you want to learn how to overclock just to learn how, search in the stickies for the overclocking guide.
I have tried overclocking and undervolting for the last week now and I can say that overclocking has not made any visible difference to my S3. Overclocking seems to be a nice option to have, but the S3 does not need it. Undervolting on the other hand reduces lag considerably when playing games for long periods. Usually my S3 started to get laggy after about 1 hour of Asphalt, but now it does not get laggy at all. I have undervolted by (-)125.
Hope that helps.
When I play pokemon black 2 on nds4droid without overclocking it gives me 20 to 30 fps and when I overclock it to 1.7 GHz i get 28 to 35 fps
Sent from my GT-I9300 using xda premium
Firstly you need a kernel supporting overclocking... Secondly its fine if u wanna play around with your device... Lastly I would suggest u to overclock it to 1704 MHz max (avoiding any boot loops )....
I would recommend Siyah 1.9.1 (as your Kernel) and "Noop" as your I/O Scheduler... In case ure using Siyah as your Kernel, try using "Lulzactiveq" as your governer...
Furthermore u can tweak the governer if u want more juice out of it....
Try it.....
Sent from my GT-I9300 (Hassan Khalid Malik) using xda premium
---------- Post added at 10:50 PM ---------- Previous post was at 10:41 PM ----------
Mr Faeces said:
I have tried overclocking and undervolting for the last week now and I can say that overclocking has not made any visible difference to my S3. Overclocking seems to be a nice option to have, but the S3 does not need it. Undervolting on the other hand reduces lag considerably when playing games for long periods. Usually my S3 started to get laggy after about 1 hour of Asphalt, but now it does not get laggy at all. I have undervolted by (-)125.
Hope that helps.
Click to expand...
Click to collapse
Lag can be reduced by tweaking your governer and some other settings... U don't have to underclock it...
Sent from my GT-I9300 (Hassan Khalid Malik) using xda premium
I have tried overclocking to1600, and although Quadrant stats are higher, I did not notice any difference in normal usage. I am a general usage text and phone calls and email user. Minimal game playing. I stick to 1400 now and everything seems just the same!!
At the moment I am running Sotmax rom and boeffla kernel.
Hope this helps.
Currently looking into the process of OC'ing and UV'ing. It would be cool to see what results you guys have got and what difference in battery life you perceive!
Im currently at stock ?
Sent from my Nexus 7 using xda app-developers app
Arthedes said:
Currently looking into the process of OC'ing and UV'ing. It would be cool to see what results you guys have got and what difference in battery life you perceive!
Im currently at stock ?
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
I have the same PVS CPU than you with 0,9 Volt at 384Mhz and 1,05 Volt at 1,5GHz.
I could undervolt 50mV accross the board; undervolt the lowest frequenz (384Mhz) to 0,73 Volt and overclock the CPU to 2,0Ghz max.
Im running Cyanogenmod with Glitch Kernel and use Trickster Mod for OC and CPU UV.
With Glitch Kernel I can even undervolt the GPU 100mv accross the board with an increased max GPU of 450Mhz.
(More is possible, but I nearly dont play games with my tablet)
With this I get about 8 hours of SOD time with Surfing.
When I'm on a long business trip and use my N7 for (Kindle and pdf) offline book reading I reach something like 13-15hours SOD time.
zz_marcello said:
I have the same PVS CPU than you with 0,9 Volt at 384Mhz and 1,05 Volt at 1,5GHz.
I could undervolt 50mV accross the board; undervolt the lowest frequenz (384Mhz) to 0,73 Volt and overclock the CPU to 2,0Ghz max.
Im running Cyanogenmod with Glitch Kernel and use Trickster Mod for OC and CPU UV.
With Glitch Kernel I can even undervolt the GPU 100mv accross the board with an increased max GPU of 450Mhz.
(More is possible, but I nearly dont play games with my tablet)
With this I get about 8 hours of SOD time with Surfing.
When I'm on a long business trip and use my N7 for (Kindle and pdf) offline book reading I reach something like 13-15hours SOD time.
Click to expand...
Click to collapse
I know a bit how i can get to know my cpu's pvs stepping, but since you have the same as me, what is it exactly? And is it considered a fast, normal or slow binned cpu?
Sent from my Nexus 7 FHD using Tapatalk
mine are way lower and im pretty stable, no crashes but i dont' play games
im on ElementalX oc to 1.728ghz
at 38400 >>> im at 77500
at 702000..... 85000
at 102600.......90000
at172800 .... 102500
Whats the best way to test stability? Ive got this app https://play.google.com/store/apps/details?id=com.into.stability but i dont seem to get any wiser... Anyone know what i should do?
Sent from my Nexus 7 FHD using Tapatalk
Arthedes said:
Whats the best way to test stability? Ive got this app https://play.google.com/store/apps/details?id=com.into.stability but i dont seem to get any wiser... Anyone know what i should do?
Sent from my Nexus 7 FHD using Tapatalk
Click to expand...
Click to collapse
yup, run that for like 30mins on classic test, should be fine if it doesn't crash
cobyman7035 said:
yup, run that for like 30mins on classic test, should be fine if it doesn't crash
Click to expand...
Click to collapse
I did that, but with voltages that are stable there, antutu crashes. And with voltages that are antutu stable, my device crashes randomly. I can run the scaling test with very low voltages across the board for more than an hour and it doesnt crash.
With other apps it just crashes.
This is an experimental undervolt that rarely crashes when switching apps:
I dont know which clock speed and its corresponsing voltage is unstable because the clock speed ranges from 384 to 1512 mhz and i dont have a crash log.
So I added 12.5 mV across the board, and this hasnt crashed so far!
But, being the perfectionist that I am, I want the Ultimate Undervolt. Is there a way to see what frequency you are running when it crashes?
Sent from my Nexus 7 FHD using Tapatalk
I achieve stable 700mV at 1026MHz...
30mins stress run on "stability test" app and on stress run on "setCpu"
At 1134MHz the tablet freezes for the first time when I switch to 7875mV
Isn't it weird??
I dont think the stability test app is working. I could undervolt 1512 mhz to 900mV and have it run stable, but everyday use stable is with 987.5mV
Sent from my Nexus 7 FHD using Tapatalk
zz_marcello said:
I have the same PVS CPU than you with 0,9 Volt at 384Mhz and 1,05 Volt at 1,5GHz.
I could undervolt 50mV accross the board; undervolt the lowest frequenz (384Mhz) to 0,73 Volt and overclock the CPU to 2,0Ghz max.
Im running Cyanogenmod with Glitch Kernel and use Trickster Mod for OC and CPU UV.
With Glitch Kernel I can even undervolt the GPU 100mv accross the board with an increased max GPU of 450Mhz.
(More is possible, but I nearly dont play games with my tablet)
With this I get about 8 hours of SOD time with Surfing.
When I'm on a long business trip and use my N7 for (Kindle and pdf) offline book reading I reach something like 13-15hours SOD time.
Click to expand...
Click to collapse
Will you post your voltage table?
What are the Kernel setup settings that you choose and have you ever OCed to 2.2 and still get good undervolting?