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Is overclocking and underclocking too many times bad? Because usually when i'm not playing a game or traveling I underclock it low to save battery and overclock it when im on constant use. Is it bad to do it too many times?

If it's overheating, YES, ITS BAD, STOP.
Overclocking and underclocking just speed up/down the cpu.
Overclocking: The faster a cpu goes, the more likely it'll glitch (Which will usually cause a freeze or reboot in Android) and the more power it takes (Which increases heat, can melt parts). There are serious risks to overclocking. Luckily, you're more likely to crash than melt something, and if that happens just reflash the rom to get back to a lower speed (Might have to wipe the phone, depends).
Underclocking: There are no bad side effects from underclocking except maybe having a really slow phone. The Sensation is already underclocked to 1.2GHz (from 1.5GHz). Underclocking uses less power and thus drains less battery. Android naturally underclocks when it's not used heavily and every time the screen is dimmed / off.
If you haven't read up on it, though, you shouldn't be messing with it. To answer your question directly, no, constantly speeding up and slowing down the cpu won't hurt it. It does that on its own all the time.

Like the person above me said, 1.5 GHz is native frequency for this CPU. So, it won't hurt the CPU as long as you don't go higher than that.
Swyped from my HTC Sensation

Thanks for that info about what the standard clock is for the Sensation (before HTC changed it).
Now I know I can clock it to 1500 and feel safe about it.

Oh no no not that I already normally set it to 1.7 ghz and its ok.
Thats not how I meant. Let me rephrase it. Is it dangerous to o/c u/c too many times back and forth?

kripwalk said:
Oh no no not that I already normally set it to 1.7 ghz and its ok.
Thats not how I meant. Let me rephrase it. Is it dangerous to o/c u/c too many times back and forth?
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I got a bit off topic, I know, sorry. Android is always changing its own clock speed. When there are no apps in the foreground, the cpu is underclocked as low as it can go. When the screen turns on, the cpu gets overclocked a bit (and when you play a game, the cpu gets overclocked a lot). There's no harm at all, because Android already goes back and forth. A lot. Boot up SetCPU and just watch the current CPU and you'll see it varies in real time.
What you're doing just changes the min/max values. Change them all you want. It won't hurt anything.

[Q] Dangers of overclocking the Sensation's GPU (Adreno 220)

Hey there,
I've read some threads about the dangers of overclocking an Android-device in general. I'm aware of these dangers.
But in my feeling overclocking the sensation is a little different.
Most custom roms set CPU-speed to 1500MHz each core, which is the native clock of the chipset (or am I'm wrong?). No problem so far.
But with tweaking the CPU often the GPU is overclocked, too.
Now the point: What are the dangers of overclocking the GPU?
Does it make sense to overclock just the CPU without the GPU? Is it possible?
What are your experiences with overclocking (e.g. with IsertCoin or RevolutionHD) the GPU?

What you have to remeber with regard to overclocking is that your not alone in doing it when you use one of the custom roms.
Many thousands of ppl are running overclocked handsets and the first things you see happening from overclocking to far is your handset not booting up or locking up well before you would do any physical damage to the handset i would say.
I have run my sensation at 1800 cpu speed and it started ok but locked up when doing one of the benchmark tools , i rebooted and reduced the speed a little but all running fine with no concerns with regard to overheating

So there is a hardware protection to prevent serious damage?

I dont know enough about the handset to say if there is or not i suspect there will be something , but have you ever tried to overclock a graphics card on a pc you get so far and it wont display or something like that so you reduce it.
Heat with any electronic component is i problem and overclocking something increases that heat, but when you get to a certain point your phone will lock freeze reboot etc usually before any damage is done.
If you have any concern about destroying your phone by overclocking the simple answere is that you dont overclock it .

Diydude said:
[...]
If you have any concern about destroying your phone by overclocking the simple answere is that you dont overclock it .
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Yes you're right of course, but i just want to get a feeling for this topic... i just try to decide if it's a good idea to use RevolutionHD, which is overclocked from the beginning.
And to get a feeling, I just asked about the risks, because the benefits are clear for me

To answer your question, yes, the sensation comes with thermal protection that helps against overheating. If the device becomes to hot, it(in most cases) shuts itself down until it cools. The CPU in the sensation is underclocked when it's shipped at 1.2Ghz(1188), but the true spec of the CPU is actually 1.5Ghz(1536). HTC underclocks the CPU to 1.2 to save on battery consumption. I personally have ran my phone just fine at the 1.5Ghz setting, I've even pushed it up to 1.6Ghz(1620) and it ran fine with the exception it did get just a little hot, but nothing to worry me. That being said I've since underclocked my CPU to 1296 and all is well. And afterall, how fast do you really need your phone to be before you take it too far and fry the cpu?? The sensation is fast right out of the box and even faster when using a NO sense rom, such as cm7(my personal fav)
Side Note : The new sensation XE ships with the cpu at it's original clock speed of 1.5Ghz.. both sensations have the 'exact' same cpu.
In regards to your GPU question, I have mine set @ 300mhz and not 320. The sensations GPU comes clocked at 266.I've ran it @ 320 and it ran just fine.. for me it's more of a personal preference. My graphics look just fine clocked @ 300mhz.. Below is a quote about the chipset and the new one coming out.
"With Adreno 225 Qualcomm improves performance along two vectors, the first being clock speed. While Adreno 220 (used in the MSM8660) ran at 266MHz, Adreno 225 runs at 400MHz thanks to 28nm. Secondly, Qualcomm tells us Adreno 225 is accompanied by "significant driver improvements". Keeping in mind the sheer amount of compute potential of the Adreno 22x family, it only makes sense that driver improvements could unlock a lot of performance. Qualcomm expects the 225 to be 50% faster than the outgoing 220."
if this helped, give the thank you button a punch
p.s. I've ran both insertcoin & revolution HD and both ran fine.. I just really prefer no sense roms

Quakeworld said:
To answer your question, yes, the sensation comes with thermal protection that helps against overheating. If the device becomes to hot, it(in most cases) shuts itself down until it cools. The CPU in the sensation is underclocked when it's shipped at 1.2Ghz(1188), but the true spec of the CPU is actually 1.5Ghz(1536). HTC underclocks the CPU to 1.2 to save on battery consumption. I personally have ran my phone just fine at the 1.5Ghz setting, I've even pushed it up to 1.6Ghz(1620) and it ran fine with the exception it did get just a little hot, but nothing to worry me. That being said I've since underclocked my CPU to 1296 and all is well. And afterall, how fast do you really need your phone to be before you take it too far and fry the cpu?? The sensation is fast right out of the box and even faster when using a NO sense rom, such as cm7(my personal fav)
Side Note : The new sensation XE ships with the cpu at it's original clock speed of 1.5Ghz.. both sensations have the 'exact' same cpu.
In regards to your GPU question, I have mine set @ 300mhz and not 320. The sensations GPU comes clocked at 266.I've ran it @ 320 and it ran just fine.. for me it's more of a personal preference. My graphics look just fine clocked @ 300mhz.. Below is a quote about the chipset and the new one coming out.
"With Adreno 225 Qualcomm improves performance along two vectors, the first being clock speed. While Adreno 220 (used in the MSM8660) ran at 266MHz, Adreno 225 runs at 400MHz thanks to 28nm. Secondly, Qualcomm tells us Adreno 225 is accompanied by "significant driver improvements". Keeping in mind the sheer amount of compute potential of the Adreno 22x family, it only makes sense that driver improvements could unlock a lot of performance. Qualcomm expects the 225 to be 50% faster than the outgoing 220."
if this helped, give the thank you button a punch
p.s. I've ran both insertcoin & revolution HD and both ran fine.. I just really prefer no sense roms
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some sources say adreno 220 can be overclocked to 400mhz .... bdw how can i overclock ...is der a app like setcpu for it ?????

rohit choudhary said:
some sources say adreno 220 can be overclocked to 400mhz .... bdw how can i overclock ...is der a app like setcpu for it ?????
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a few time ago some other user reported the same thing about adreno 220
but i think it is too high that value and it is impossible for gpu to handle such a value
in order to overclock the gpu you have to flash another kernel

[Q] Is Overclocking your phone really that safe?

Hello, as the title states, I was just wondering whether over clocking the phone can "break" the phone?
Also another question, Which Sebastian kernel should I use on Virtuous inquisition rom?
Would really appreciate some help with this.
Thanks a lot

I have never had a problem over clocking any of my phones. I do find you need to find that optimum speed, for best performance.
List of phones I have overclocked.
HD2
Nexus S
Nexus One
EVO
Sensation

Heat from overclocking your phone can break your phone but the sensation processor is supposed to be 1.5ghz stock. Pretty sure phone has a built in sensor that shuts it off before allowing it to overheat and fry the chip.

No kernel will really allow any unstable over clock levels, at least not without warning you. The processors in our phones were designed for 1.5ghz but HTC under clocked them stock to save battery. You can still go above 1.5 without damaging your phone. It might shorten the life, and yes you have a very slight risk of overheating but like the other guy said, your phone will turn off before killing itself. You will see a bit more battery drain though. Personally I've found it rather pointless to over clock. If I do I only go to the designed speed of 1.5. With a dual core processor I just don't see the point in going over that.
Sent from my HTC Sensation Z710e using XDA App

Using overclocked kernel brings some heating.

Hi all.
Im using SebsstianFM 1.5 GHz kernel on my sensation . It becomes warm and heats my fingers, so I can't resolve is this an issue. I thought before that htc sensation has the same chipset in both xe and non-xe series. Hasn't it?
Perhaps Im unlucky one with the specific cpu or some heating is normal?
Thanks a lot in adv

Every processor is different, some can handle higher clockrates than others. Try underclocking it.

Thanks, I do.
But I'm sad a bit when informed about new Sebastian 1.7 GHz kernel. As for me 1.3 is the far frontier..

garryveda said:
Thanks, I do.
But I'm sad a bit when informed about new Sebastian 1.7 GHz kernel. As for me 1.3 is the far frontier..
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try it without charger for a while, the chips are made for 1512MHz
it can get hot for me when running on 1512 but only with charger

For me 1.5 GHz was OK, only got "hot" when I played 3D games like CS and FIFA, but I Find the 1.35 GHz a bit friendlier for the battery (and at the clock the phone very rarely gets hot).

No prob here with Sebastian's V1.30.1 @1.5ghz yet again all chips handle every frequency in a different manner
Sent from my HTC Sensation Z710e using Tapatalk

How hot is hot? Am using using bricked 1.6 for aosp and I o/c to 1.9 Ghz to run benchmarks. After 10 minutes set at performance my battery hit 80° lol. Good benchmark scores tho.
Daily I use 1.56 Ghz and all is fine, wish I could o/c to 2ghz tho, just for the sound of it
sent from my Sensation XE

I didn't realize installing Sebastian's kernel would overclock me to 1.7GHz. My Senny is cooking over here. Anyone know where I can find the stock kernel? Or should I just slow it with SetCpu?
NVM...found it!

As for mine one it is really hot. Phone got 50 degrees within five using minuites while 1.5 GHz running. Though it is quite cold when used usual way like the calling, messaging etc. But anytime I load it with real tasks like playing 3d games, shoting videos it becomes hot and not suitable to use.
So 1.3 is my top...

Overheating for me is usually because of the app. Poorly built apps can cause overheating. My phone overheats even with the stock HTC 1.2GHz kernel when playing certain games.

Use SetCPU as a govenor to set the processor automaticly back to 1,2 Ghz when overheating.

I guess my processor is one of the luckier ones, I'm getting 1.72GHz under volted with no problems At the end of the day the Sensation was 'designed' to run at 1.22GHz so anything above is a bonus

You should be glad your phone doesnt blow up...as far as i see it, 1.7 ghz speed is so much closer to the netbook laptop processor speeds we get these days. these netbooks come with built-in exhaust fans to avoid heating up of the processor.
The sensation does not have such hardware builting, so its better not to overclock it too much or you might end up with a burnt up phone.

ARHD rom has a stock kernel , U can try it :d

Situation has chanched since I got updated with ARHD 6.5.3. For now I'm using 1.6 SebastianFm kernel with no prob.
Phone is comfortable with its temperature even when hard tasks running.
I don't know whether the new ROM is brilliant or the weather becomes more warm causing not to feel device heating with my fingers.
The fact is that issue has gone and I'm happy

sensation & sensation XE cpu chipset comparison

i'm sure this has been asked before but i just want to make sure. both the sensation and the XE have the same cpu chip but the XE chip is O/C'd to 1.5 ghz, correct? meaning i can O/C my sensation to 1.5ghz and run it daily without any worries of shortening its life? also, what is the max frequency this chip can handle, safely?
HTC|Sensation|Cambodia

swift2fly said:
i'm sure this has been asked before but i just want to make sure. both the sensation and the XE have the same cpu chip but the XE chip is O/C'd to 1.5 ghz, correct? meaning i can O/C my sensation to 1.5ghz and run it daily without any worries of shortening its life? also, what is the max frequency this chip can handle, safely?
HTC|Sensation|Cambodia
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The normal Sensation is in fact underclocked, so by clocking it to 1.5 you are releasing its ability.
As far as the Max is concerned, mine tops out @ 1.72 before I start getting problems (shutdowns and VERY warm handset)
Remember every chip is different so what is good for me may not be good for you, or you may even be able to go to 1.8!!!

mrew42 said:
The normal Sensation is in fact underclocked, so by clocking it to 1.5 you are releasing its ability.
As far as the Max is concerned, mine tops out @ 1.72 before I start getting problems (shutdowns and VERY warm handset)
Remember every chip is different so what is good for me may not be good for you, or you may even be able to go to 1.8!!!
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thanks for the info. i can OC up to 1.83, anything after that my phone would just reboot. if the chipset is underclocked ive been underclocking it even more to 1.18.
HTC|Sensation|Cambodia

The Sensation and Sensation XE use identical hardware - just with the case of the Sensation, as pointed out by the previous post, is underclocked - the Sensation XE is just clocked higher, has had a lick of paint and been covered in Beats gimmicks. Which is pretty worthless if you're flashing ROMs anyway.
When it comes to overclocking, any form reduces the lifespan of components, but not to any sort of level that you should be losing sleep over. You should just play around with clock speeds and get the balance between speed and stability you're looking for. As pointed out in countless threads, every CPU is slightly unique, so some can take higher clocks than others, whilst some can only just make the 1.5GHz mark, or so I have read.
If you do go over 1.7GHz, it is probably worth keeping an eye on any excess heat being kicked out. Overclocking does have a slight degradation on battery life, but it's heat you should be wary of. Heat is the death of electronics, and warranty doesn't cover overclocking (although, if you are overclocking, you're rooted, so your warranty is void anyway ).
Just don't go mad. In my opinion, it's definitely worth bridging the gap between the Sensation and the XE by bolstering it up to 1.5 GHz, but after that point, it becomes more of a benchmark game - which don't really mean anything anyway. Clock speed isn't everything - it's more down to the architecture of the CPU more than anything.

Pash. said:
The Sensation and Sensation XE use identical hardware - just with the case of the Sensation, as pointed out by the previous post, is underclocked - the Sensation XE is just clocked higher, has had a lick of paint and been covered in Beats gimmicks. Which is pretty worthless if you're flashing ROMs anyway.
When it comes to overclocking, any form reduces the lifespan of components, but not to any sort of level that you should be losing sleep over. You should just play around with clock speeds and get the balance between speed and stability you're looking for. As pointed out in countless threads, every CPU is slightly unique, so some can take higher clocks than others, whilst some can only just make the 1.5GHz mark, or so I have read.
If you do go over 1.7GHz, it is probably worth keeping an eye on any excess heat being kicked out. Overclocking does have a slight degradation on battery life, but it's heat you should be wary of. Heat is the death of electronics, and warranty doesn't cover overclocking (although, if you are overclocking, you're rooted, so your warranty is void anyway ).
Just don't go mad. In my opinion, it's definitely worth bridging the gap between the Sensation and the XE by bolstering it up to 1.5 GHz, but after that point, it becomes more of a benchmark game - which don't really mean anything anyway. Clock speed isn't everything - it's more down to the architecture of the CPU more than anything.
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thanks for the info. i dont plan to over do it. i recently installed GTA3 and it was running slow and choppy so i set my cpu to 1.5ghz and cpu governor to "performance" and it runs the game smoothly. just wanted to make sure that its ok to run it at 1.5 for a long period of time. i dont really have a reason to clock my cpu any higher. if anything i'd just stick to 1.18 just for battery consumption reasons.
HTC|Sensation|Cambodia