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Root SetCPU overclock question

Discussion in 'Android Devices' started by RunVert, Feb 22, 2011.

  1. RunVert

    RunVert Well-Known Member
    Thread Starter

    So the upper limit on setCPU is 998.
    I have read that it is possible to increase this value for overclocking purposes with a custom kernel.

    1- Is this true?
    2- how high can you set it?
    3- does setting it higher than the 998 value make the phone
    visibly faster?


  2. stevcha

    stevcha Android Expert

    1- Is this true? Yes
    2- how high can you set it? Depends on the Kernel you flash. On Ziggy Kernel I can go as high as 1.2ghz but its not stable. 1.1ghz is the safest I've clocked to.
    3- does setting it higher than the 998 value make the phone
    visibly faster? It can but it also depends on other factors like the ROM and Kernel combo.
  3. Muellersirch

    Muellersirch Newbie

    1- yes it is possible, but you do have to flash a custom kernel
    2- depends on the kernel that you flash, I am running snap (on CM6.1.2), and have a max freq of 1190 ( i think that is pretty close to the highest that you can find)
    3- I think it does, but it is kind of personal preference. try it out and see how you like it. you can always go back to stock if it doesn't work like you wanted
  4. akazabam

    akazabam Android Expert

    1) Yes and no. The minimum and maximum available frequencies are determined in the kernel, along with a few other options such as governor choice. It's up to the kernel developer what they want to set those values to. *Most* custom kernels have the maximum available frequency higher than 998, but don't assume that just because it's a custom kernel that you will be able to overclock. That being said, if you flash a custom kernel such as netarchy or ziggy's, you will definitely be able to raise the maximum.

    2) Most kernels allow you to set the frequency higher than most phones will actually be able to overclock to, and still be stable. Netarchy, for example, can be overclocked to 1267 MHz. If you raised the slider up that high, your phone would immediately lock up and reboot. If you had he option set to set at boot, you'd end up in a bootloop that only a nandroid restore could fix. So, needless to say, when testing the max, leave that option unchecked. Most people are able to overclock to 1152 MHz, and have everything run stable. Some can go up to 1190, and even a little higher. It also depends on the kernel. You might be able to go up to 1190 on one kernel, but only 1152 on another.

    3) Maybe. Other things can cause both smoothness and choppiness. Governor (scaling) choice, for example, will play a huge role here, too. Likely, though, unless you overclock as high as 1152 - 1190, you probably won't notice much. Even then, don't expect to see a huge gain in real world use. Try it out and see.
    RunVert likes this.
  5. evomattnc

    evomattnc Android Expert

    1. That is correct.
    2. Every one I have flashed has a 1267 max I think. I can never actually set mine to the max speed or it goes to a sweet boot loop. Usually keep mine at 1190 if i want performance and am hooked up to a charger.
    3. The phone will be visibly faster, you can watch the battery drain too.

    I use set cpu and set up separate profiles so mine overclocks when im attacched to a charger, runs pretty much stock otherwise, and underclocks if the screen is off or battery is low to save battery. Be sure not to set anything to start at boot until you are sure your settings are stable or again you'll get a nice boot loop that will require a battery pull.

    I am currently using netarchy 4.3.2 cfs nosbc havs less, youll want to read up on the differences between all those abbreviations, short of it is, cfs is more stable tnan bfs for most, the graph would basically have less peaks and valleys than with bfs. Havs has to do with supplying different voltage levels based on cpu usage, theoretically saves some battery, sbc is a bit of a mystery to me, hopefully someone jumps in on that one. I dont use it because i have heard that it was harmful to a li-ion and that it wasnt, so since im not an electrical engineer just a mechanical i ere on the side of safety and get no sbc. Anyone more familiar with these forums have a thread or sticky that is useful for explaining kernels?
    RunVert likes this.
  6. evomattnc

    evomattnc Android Expert

    AKAZABAM, always one minute ahead of me lol, i might as well not post, we dont need anyone else when you are around haha. j/k we all added something to the convo...at least i hope so...
  7. akazabam

    akazabam Android Expert

    Here's a good guide for you:

  8. akazabam

    akazabam Android Expert

    Lol, hey, when a bunch of people reply, we all think of things somebody else didn't. It's better that way. And for the record, two other people beat me to it, too, so...
  9. RunVert

    RunVert Well-Known Member
    Thread Starter

    You guys are quick and know what you are talking about! wow!
    Thanks for the quick responses, info and tips!

    ...one more quick question- does the "overclock widget" and "setCPU" run the same tasks? which do you prefer?

    ...Thanks again!
  10. evomattnc

    evomattnc Android Expert

    Yeah i get the idea of sbc, not sure the details like what trickle charge ACTUALLY is, though i assume the name is self explanatory. I have read both sides of the argument on whether its is detrimental to the battery...your opinion?
  11. evomattnc

    evomattnc Android Expert

    I have used both, overclock widget can run two different profiles basically, screen on, and screen off, i used it because it was free. You can set it and forget it, theoretically but I tinker too much for that, but I like the ability to set up numerous profiles in Setcpu. Also I ran overclock widget for a while and never found an option to change the governor. To me setcpu was worth the dollar and some change.
  12. stevcha

    stevcha Android Expert

    I've seen users who have used sbc kernels without issue since they were released. I've seen others who have said their batteries drain faster since using it.
  13. evomattnc

    evomattnc Android Expert

    that cleared up absolutely nothing lol :). Im going to stay on the safe side I guess.
  14. stevcha

    stevcha Android Expert

    Lol yeah that's basically where we are with the sbc kernels. No difinitive answer.

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