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Thread: Coppermine pentium III 500 MHz, covering "A14"?

  1. #1
    Join Date
    Mar 2006

    Default Coppermine pentium III 500 MHz, covering "A14"?

    I've got this Dell latitude CPx H500GT, with a 500 MHz Intel Pentium III E Coppermine CPU (100 MHz, 5x). I was looking around for some way to overclock it, but my first impression was that I'm out of luck. Dell locks the multiplier and FSB settings in the BIOS, and a program like CoolCPU won't work either since I have a clock chip from IMI with code SM530, which isn't on the list (had a hard time finding the chip too, I still don't know where that crystal is...). But then I came across this site:
    It's not all the same as a dell motherboard/CPU combo, but I think there should be an equivalent to "A14" right? The pins are in a rectangular grid so I'm gonna have to figure out which one is pin A14.

    Are there any obvious flaws in my logic, which will make this impossible, or hazardous to my system? (more hazardous than usual overclocking, that is)

    Also, it's not possible to flash the BIOS to allow FSB changing, is it?

    PS: I know my laptop sucks (on board rage mobility M1 graphics card for christ's sake!), but still it'd be cool to have it overclocked :)

  2. #2
    Join Date
    Jun 2003
    Sunderland, England

    Default Re: Coppermine pentium III 500 MHz, covering "A14"?

    the extra heat could cause major problems unless you devise some kind of wierd cooling system which would probably remove all portability and involve lots of fans
    <img src=" rans=yes&.jpg" alt="" />

  3. #3

    Default Re: Coppermine pentium III 500 MHz, covering "A14"?

    I have an Inspiron XPS2 and have also tried soft overclocks with no luck. I've even had the creator of SoftFSB(or something like that) send me some test programs with me sending info back to him in the attempt at getting an overclock done with no avail. I finally found a way to overclock my video card by flashing the BIOS. It does get quite a bit warmer, but works very well. If you can find some BIOS editors and a flashing tool you should be able to OC. I suggest starting out ~525, checking heat/stability and then going up 5~10MHz each time till you find your limit. As stated above, heat will probably be your limiting factor in a laptop.

  4. #4
    Join Date
    Mar 2006

    Default Re: Coppermine pentium III 500 MHz, covering "A14"?

    I just opened my laptop, and the grid is nicely numbered like a chessboard is numbered, so finding A14 isn't hard. For some reason I though A18 was the pin I had to cover, so I did that, but then the bios didn't load past half, then it'd reboot itself. It got me doubting so I figured I'd try A14, which I think I have now covered. Everything goes fine for now, I can write this message obviously :P

    CPU-z says it's 497.9 MHz, but I believe it's reading that from a system sensor. It could also be that my covering got loose, the strip of isolation tape is less than a milimeter wide... lucky A14 is at the side so I can make the strip a little longer..

    hmm CPU speed says the same thing.. I'm gonna shutdown and check the cover.. Left the screws out anyway.

    matm, would you know a place where I can find an alternative bios?

    edit: Damn.. it didn't look faulty, and with my new bit of tape it's still running at 500 MHz... The picture on the site looks like it has alot less connections than the pins on my board though.. maybe I need a different one... but I wouldn't know which one
    Last edited by Oris.Marii; 03-30-2006 at 05:28 AM.

  5. #5

    Default Re: Coppermine pentium III 500 MHz, covering "A14"?

    Quote Originally Posted by Oris.Marii
    matm, would you know a place where I can find an alternative bios?
    Nope, do a search or's what I did.

  6. #6
    Join Date
    Mar 2006

    Default Re: Coppermine pentium III 500 MHz, covering "A14"?

    I've been searching, haven't been able to find an alternative bios..
    I did read up about the locked multiplier setting on the PII and newer, which also led me to a pinmod of the PII to make it run at 133 MHz instead of 100.
    By grounding the BSEL[0] the motherboard would believe there was a 133 MHz processor present. The article doesn't speak of the PIII however, so I went looking myself. (page 25)
    This datasheet tells me that if BSEL[0] and BSEL[1] are both high, then the frequency will be 133 MHz. BSEL[0] is high by itself, since with BSEL[1] at low, this is the 100 MHz setting.
    My question: to make BSEL[1] high, could I just connect* it to BSEL[0]?

    *As for connecting them, I can't take off my CPU, since it's nicely covered by a metal cover which is impossible to remove without damaging stuff, but I might be able to connect the pins on the underside of the board. It seems like most pins have equivalents on the other side (I haven't yet checked if the BSEL ones do too).

    edit: Hm. I know laptops have custom parts, but I didn't think they'd go as far as having a custom-built CPU. My CPU is 25-pin width, instead of the normal 37 (page 68 of the PDF). Also, instead of having a pin every other spot, it has one at each spot, making a grid with a pin at every intersection.
    here are some (blurry) pictures (not mine)
    At the bottom picture you can see the heatpipe, beneath the copper plate is the CPU (or so I assume). I don't know what beneath the other metal cover is. The rectangular chip can be taken off, and is connected by a larg rectangular set of tiny pins. (underneath the chip I found the clock chip)
    If anyone wants clearer pics I can take some tomorrow.

    Here's a pic of the rectangular connector

    I also found a pic of the totally awkward CPU, although this is an 850 MHz one..

    does anyone have an idea about how I can identify the BSEL pins now?

    edit: All is not lost. New datasheet: page 54
    The pins are nnow a little apart, but that doesn't matter since I wouldn't be soldering to the pins, but to the board itself. Remains the question of what to solder it to. Could I solder it to the other BSEL, or to one of the VCC/VSS/VCCT points? I don't know what they are, or what would give me a high. Anyway, I'll go to sleep now (0:45). See you in the morning.

    edit: I connected them.. but it's still running at 500 MHz.. Maybe BSEL[1] is pulling BSEL[0] low... A succes right about now would be nice, really...

    edit: I connected both to a VCC point... Still nothing. I'm kind of out of ideas now.
    Last edited by Oris.Marii; 04-03-2006 at 07:58 PM.

  7. #7
    Join Date
    Feb 2009

    Default Re: Coppermine pentium III 500 MHz, covering "A14"?

    Could you please tell me what the result of this work was?
    I just managed to set up the core voltage to 1.65 (before it was 1.57) That is all I could do?

    Very interesting if you managed to change fsb from 100 mhz to 133 or othe freq

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