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K6/3 450mhz Overclock

By Cucumber ยท 13 replies
Jul 3, 2002
  1. Hey lads, ....we have 2 decent PC's in our house and a fairly old:
    K6/3 450mhz
    256mb PC100
    Kyro2 32mb (my old card from my PC)

    And playing Counter-Strike is *Ok* but when you go in a server with a large number of people in, it becomes v.slow :mad: so looking at those specs its obvious that the CPU is the bottleneck!...I do intend on upgrading it (when i get my new CPU/Mobo/RAM) but until then id like to O/C it a bit! Now, in BIOS there is an alteration of the FSB, it goes ...100mhz, 124mhz, and then 136mhz*i think* :eek: iv tried altering this but when i do nothing happens and the PC does not boot! But there are Jumpers on the motherboard, and so does overclocking work Via the jumpers?...n00b question i know:blush: As the board manual only specifies jumper settings for K6/3 CPU's upto 450mhz..BUT! it shows settings for other CPU's e.g. Celeron upto 600mhz!

    Long story sorry.... anyways someone told me that the first 2 or 3 jumpers are for the type of CPU, and the last ones are for the multiplier of the CPU, so if i were to leave the jumpers showing it as a K6/3 and changed the rest..to say a 500mhz Celeron, would that work, possibly, maybe? O how much of a n00b do i sound

    If this is entirely stupid, and will never work, please just say so:eek:


  2. uncleel

    uncleel TS Rookie Posts: 980

  3. JAV

    JAV TS Rookie Posts: 210


    You can try CPUCool www.guru3d.com & it can software tweek the registry to higher settings, but you'll need to know the mobo brand & # to use it too.

    You may be correct & you may have to hardwire the FSB, tho'. There also might be voltage settings that have to be set for that K6-3 & the 2.0volt Celeron settings won't work. I dunno, but you should check that too.

    Search the archives at Toms Hardware or OCZ for K6 oc's. I believe I've seen articles there on them.

  4. guyferd

    guyferd TS Rookie Posts: 31


    If you want to overclock your AMD, you can try
    Powertweak . But be careful :D
  5. Cucumber

    Cucumber TS Rookie Topic Starter Posts: 154

    Thanks 4 your help!:grinthumb
    ...I think ill just wait until i get my new stuff in a couple of weeks, dont wanna risk breaking anything, as itll be hard to replace and this PC will also be passed on!:blackeye:

    Anyways Cheers Lads:grinthumb :grinthumb

  6. Mictlantecuhtli

    Mictlantecuhtli TS Evangelist Posts: 4,345   +11

    K6-3 doesn't have multiplier lock, does it? I used to have K6-2 aeons ago, 350 MHz went to 475 easily :). Just play with FSB & multiplier until you fry your rig - oops I mean until speed is good for PCI & AGP and fast enough for CPU.
  7. Cucumber

    Cucumber TS Rookie Topic Starter Posts: 154

    Is there a reason why increasing the FSB would not work in particular? As even the slightest adjustments cause the PC not to boot!
  8. JAV

    JAV TS Rookie Posts: 210


    How are you adjusting it? BIOS or ??? What is stock & what is 'slight'? Are you also saying it won't boot into 'safe mode' either? Have you unplugged it for a few minutes & tried again?

    I & others need to know the what/how so we can help with the 'what now?'. ;)

    Do you have 'recovery/restore' disc's/drive if necessary? Always wise to have them updated when 'tweeking'. No 'salt in the wound' intended, just a word to the wise when the new system comes. :D [and this one is back up]

    Let us know,
  9. Per Hansson

    Per Hansson TS Server Guru Posts: 1,943   +194

    We used to discuss this quite allot in the old forums, I had a K6/2 CPU myself back then...

    Though you generally can only overclock them by 50mhz or so :(

    Go take a look in our old forums if you like
  10. Cucumber

    Cucumber TS Rookie Topic Starter Posts: 154

    Well i tried putting it to 112mhz FSB(which is the next one up from the default), from the standard 100mhz!(In BIOS) But nothing worked :confused: the montior never even came on
    ...the PC still works, theres a little reset CMOS jumper on the motherboard.;)

    If i were to change the jumpers on the motherboard, would that work? Sorry if this sounds like a n00b question, i've just never had to overclock before without "SoftMenu III":p
  11. Per Hansson

    Per Hansson TS Server Guru Posts: 1,943   +194

    Well 4,5 x 112 after all is a 54mhz O/C, perhaps your chip can't handle that...

    If you try to lower the multiplier one notch and then increase the FSB everything should work, if that is the case your CPU can't handle the 50mhz boost and as such we can conclude on that the O/C attemp was failed...

    Note: When I O/C:ed my K6/2 I used the (at the time) top of the line Alpha PAL 6035 (without copper insert) though I could only manage a 50mhz increase if I don't remember wrong...

    www.1coolpc.com still has them for 25$ if you are interested, though this is an improved model with copper insert in the bottom...
  12. JAV

    JAV TS Rookie Posts: 210


    When you up the FSB it affects all the ports/busses equally. Changing the CPU multiplier doesn't change the PCI, AGP, etc. DIVIDERS.

    For instance: @ 100FSB the PCI divider is 1/3 = 33.3mhz PCI. Same with AGP. @ 112 & 1/3 = 37.3mhz on the PCI & AGP. You're cooking the bus. You'd have to change those dividers to 1/3.363 to achieve 33.3mhz so they will run in their specs.

    If you have PC-100 & you are running it @ 112, it's going to run hot too, if it runs. Cooling does help disperse the heat generated, but it doesn't slow down the process.

    I *do* run my PCI/bus @ 36.3 (no AGP 4 me :( ) I think you could too. That would be 109FSB. Your BIOS won't allow that, BUT ... CPUCool just might. :grinthumb That's how I got 36.3.

    It works out to ~491mhz for that CPU.

  13. Didou

    Didou Bowtie extraordinair! Posts: 4,274

    Your best bet would certainly be to raise the multiplier rather then the FSB. I had a K6-2 450 ( 4.5x100 ) that I raised to 550 ( 5.5x100 ).

    The K6-2/3 range of CPUs was not multiplier locked. I tryed to overclock by FSB but whichever setting above 100 that I would try wouldn't even post ( & I was lowering the multiplier ).

    Or you can always save some money & upgrade to a Duron/Celeron combo.
  14. Cucumber

    Cucumber TS Rookie Topic Starter Posts: 154

    Cheers lads:grinthumb got it to post at 500mhz, and 475mhz..but during boot up it came up with all sorts of errors:mad: In a few weeks im getting some new stuff 4 my PC, and the overclocking attempt was only a temporary solution, as i knew i would be getting these things and the PC would then be upgraded;)

    Anyways thanks 4 ur help:grinthumb
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