For those of you worried about overclocking put your minds at ease

Discussion in 'Android Hacks and Help' started by Geken, Feb 2, 2010.

  1. Geken

    Geken New Member

    Joined:
    Nov 15, 2009
    Messages:
    27
    Likes Received:
    0
    Trophy Points:
    1
    Ratings:
    +0
  2. dawningmoment

    dawningmoment New Member

    Joined:
    Nov 13, 2009
    Messages:
    28
    Likes Received:
    0
    Trophy Points:
    1
    Location:
    Queens, NY
    Ratings:
    +0
    That's good news. But does that mean it's impossible for these chips to get that hot? Anyone know of a way to gauge the heat on the chip?
     
  3. wuyanks

    wuyanks DF News Team
    Premium Member

    Joined:
    Nov 6, 2009
    Messages:
    2,389
    Likes Received:
    1
    Trophy Points:
    101
    Ratings:
    +1
  4. RinTinTigger

    RinTinTigger Premium Member
    Premium Member

    Joined:
    Nov 4, 2009
    Messages:
    2,902
    Likes Received:
    2
    Trophy Points:
    103
    Location:
    Germany, Near Frankfurt/Main
    Ratings:
    +2
    Having a DROID overclocked to 1.1ghz in your pocket will cause heat. do you know under what circumstances they took those temperatures?
     
  5. Geken

    Geken New Member

    Joined:
    Nov 15, 2009
    Messages:
    27
    Likes Received:
    0
    Trophy Points:
    1
    Ratings:
    +0
    I don't know the circumstances, but you know manufacturers, they are always talking extremes.

    It would be best to keep the temps well under 105 C, simply to maximize the life of the processor. but given the temps we are getting now (around 40 - 45 C under load at 800Mhz) we should be okay, especially since most of us are only going to have these things for 2 years or so.
     
  6. wuyanks

    wuyanks DF News Team
    Premium Member

    Joined:
    Nov 6, 2009
    Messages:
    2,389
    Likes Received:
    1
    Trophy Points:
    101
    Ratings:
    +1
    just an fyi,

    if you use SetCPU, when your phone is in said pocket, it will go into sleep mode, and trigger a slower speed (as low as 125mhz)
     
  7. mikes

    mikes Member

    Joined:
    Jan 10, 2010
    Messages:
    304
    Likes Received:
    0
    Trophy Points:
    16
    Ratings:
    +0
    That's completely meaningless.

    First, as you said, it is not the processor used in the Motorola Droid. Second, you list the range for the extended temp part - there's also a commercial part with a range of 0-90C. None of the teardowns on the web have bothered to remove the RAM chip which covers the application processor, so the markings aren't visible to determine the specific chip they used.

    Finally, when a manufacturer purchases in the quantities used in the Droid, they can order custom spec parts, trading off (as an example specific to the spec you quoted) temperature range in order to get a better price. Only Motorola and TI know the actual spec for the chip used.
     
  8. bL33d

    bL33d Member

    Joined:
    Jan 2, 2010
    Messages:
    819
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    illinois
    Ratings:
    +0
    U know that no matter what speed u are at for Max speed
    Means nothen for when ur phone is not in use. The
    Phone can go to 1ghz but only when running programs
    it ain't just gonna run maxxed out all the time... when
    Not in use it wont run any faster or hotter then a stock droid.
     
  9. Geken

    Geken New Member

    Joined:
    Nov 15, 2009
    Messages:
    27
    Likes Received:
    0
    Trophy Points:
    1
    Ratings:
    +0
    I don't think I would call it completely meaningless, I am just providing some information, I didn't claim anything crazy. I was just referencing it so people didn't worry about getting their chips up to 40C . I was simply trying to be helpful.

    I am not arguing your point, which is valid, I'm just saying that there's some info out there and the chips are similar. I think it's a valid assumption that the operating temps are similar and not dramatically different.
     
  10. mikes

    mikes Member

    Joined:
    Jan 10, 2010
    Messages:
    304
    Likes Received:
    0
    Trophy Points:
    16
    Ratings:
    +0
    Well, there's this:
    So, you were doing more than simply providing information, you were telling people that the information should somehow ease any concerns they might have about overclocking and heat.

    What I pointed out was that the information you provided didn't apply to the Droid, so any such claims based on it were meaningless. Which is correct.

    How do you know that's the junction temperature (which is what the datasheet refers to)? All the temp apps I've seen use the AK8973 sensor, which is thermally remote from the OMAP3430 substrate. Without knowing the thermal design, the only valid assumption is that the measured temp moves in the same direction as the average processor temp (as long as the ambient temperature is constant).

    Even if one did know the exact relationship between average processor temperature and the sensed temperature, the processor itself has 9 independent voltage domains. It's entirely possible (for example), that the processor is overclocked and getting too hot, while the rest of the chip is not, so the average temperature appears OK. The only way to be reasonably sure is to measure the current for each of the supplies. TI provides a table showing maximum current draws for exactly that reason.
    If that is the case, then this too would apply (from the datasheet):
    Clearly, TI's concern is that damage is cumulative - the more you run it, and the higher the temperature and/or frequency, the shorter the expected lifetime. It appears that running the processor at 600MHz (OPP5) "burns it up" about twice as fast as running it at 550MHz (OPP4). Even higher overclocking likely accelerates this further.

    IOW, overclocking will damage your Droid. Probably not quickly or catastrophically, but it should be expected to shorten it's lifetime.

    "OPP5-6" refers to the core/processor supply voltage. There are lots of claims that the Droid is underclocked @550MHz, and TI specs it for 600MHz. Again, making the (possibly invalid) assumption that the Droid has the same specs as the OPA3530, we find that the actual TI spec is 550MHz @ OPP4. 600MHz requires OPP5, which is simply not supported at junction temperatures above 90C (see above). It's not clear exactly what changes the people building overclocking kernels are making - these may not change OPP, and hence be putting the processor into an unsupported area (which is almost definitely the case for any overclocking beyond 600MHz).
     
  11. drmcstford

    drmcstford Member

    Joined:
    Jan 25, 2010
    Messages:
    72
    Likes Received:
    0
    Trophy Points:
    6
    Ratings:
    +0
    I have the Verizon Extended Warranty if anything happens take it back to my friend who works there no ?'s asked and bam new phone :icon_ banana: I have mine at 800 mhz
     
  12. Geken

    Geken New Member

    Joined:
    Nov 15, 2009
    Messages:
    27
    Likes Received:
    0
    Trophy Points:
    1
    Ratings:
    +0
    Cool, thanks for the input, that all makes sense