oc'ed AMD K6-III - need advice
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Thread: oc'ed AMD K6-III - need advice

  1. #1
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    oc'ed AMD K6-III - need advice

    Hi folks!

    I am running an AMD K6-III/400 2.4V at 4.5x100 and 2.5V (2.4 Volt was fine but stability was a bit on the edge with two or three apps) with stock HSF. It is running on a DFI K6BV3+ (equipped with GL 518SM system monitor). I have an old 12V PSU fan blowing air over the cpu/HSF unit (I didn't mount the fan to the front to blow air into the case, as the noise that was produced was terrible ) and my case (rather old AT tower) is closed.

    Right now, I am NOT using any software cooling, the BIOS reads about 40-42C (btw will the CPU get hotter when in action or does it run at max tem anyway w/o software cooling?).
    Now I have some q's:

    The first is: Is the temp OK? or should I really hurry to get more/better cooling?

    the second is how many degrees have to be added for the actual CPU temp (I think the monitor diode is below the CPU right in the middle of the socket), and what is the max temp for my CPU type?

    And finally, what will be the better setup, 450 MHz (4.5x100) or 475 MHz (5x95), performance wise?

    thanx for all comments
    cya, Ford

    ------------------
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

    [This message has been edited by Ford Prefect (edited 08-14-2000).]

    [This message has been edited by Ford Prefect (edited 08-14-2000).]
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

  2. #2
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    oh and btw with cpu idle my temp is around 33C...

    ------------------
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

  3. #3
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    40.c is a good temp, not much to realy worry about.. although you cant go wrong with lower temps.. with the stock core voltage being 2.4v you would be safe running it up to 2.8v, but heat would be an issue. As for being @ 450 or 475, there are some ppl who will say run it @ 450 because running your fsb at 100mhz will add bandwidth, others say go for more mhz because it will run the on die L2 cashe on the k6-III at a high speed. I say run some bench marks to find the best results for your system.. I have a k6-III 450 that is currently running @ 560 2.8, (thanks to a peltier and an Alpha HO.. I had to run it @ 2.9 for a while to make it run stable at 2.8v, but it has now been running there for about 6 months, no-stop for the most part.. The only time I turn it off is when I'm going to be away for a few days.. I dont think you will hit 560, but you have a good shot @ 504 (4.5x112) even with air cooling.. You might need a bigger HS/Fan combo.. I recomend the Alpha HO w/ 60mm fan.. this should do the trick.. Good Luck!

    ps, to get a more precise temp reading, put a dab of thermal compound on the temp probe, and bend it up a little, utill it just makes contact with the bottom of the chip.(make sure you dont bend it to high, or your chip might not seat correctly)...

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  4. #4
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    first thx for your reply...

    for the 504 thingie I guess I'm out of luck as my mobo won't go above 100MHz FSB... you know, I'm only a part-time-overclocker .

    I'll try the bend-up trick on the sensor, thx!

    anyway I'm not really interested in heavy oc'ing with peltier stuff... I'm fine with my 50 MHz gain, just want to make sure I'm on the safe side of the thermometer .

    Thx again for your advice!
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

  5. #5
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    Evening Ford Prefect, your temps are almost identical to what I'm getting on my system. Anything in the low to mid 40's are fine, when running intensive games your temps will go up 5-10 degrees C. Getting 450 on a stock H/S and fan and at 2.5v is pretty good. I've been using Rain 2.0 for several months now, nice little program. It took me 2.6v and a large generic H/S with a 23CFM 60*60 fan to get 450 on my 2.4 core. They may not be Athlons or P-III but the K6-3's are nice little processors.

    K6-3 400@450 2.4core@2.6v
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  6. #6
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    Ford Perfect - Nice set up you got there! I use a lot of DFI boards in systems I build for people. They are one of the most stable boards for ss7 made. Anyways, back to your ???........

    Your temps are in line with other K6/x series chips. In fact, your running pretty cool for overclocking with the stock HSF! The extra fan is helping a lot it seems. I would go to an ALPHA, or GlobalWin FEP32 or FKP32 set up to cool it down more. With that change, you should get 500mhz with a little more voltage...

    As for the diode accuracy, make sure it's touching the bottom of the CPU. If it is, it should be within 2-3 degrees of actual temp. I use a temp probe to check and the GL Monitor seems to be pretty accurate.

    The higher FSB speed is the better, but it's not as critical with the K6/3 due to the on-die L2 cache running at full processor speed. Like AMD100 said, benchmark it and see!

    Good luck!

    [This message has been edited by AMDnut (edited 08-15-2000).]
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  7. #7
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    thx for your reply AMDnut!

    yeah I love that DFI Board, it only lacks maybe a probe for mobo / case temp and bus speeds over 100 MHz... apart from that it's really a nice one, especially b/c it has a TON of slots, even 2 ISA slots

    As for the 500MHz, I got it to POST with 5x100 and 2.8v, but it won't boot at all (my LILO prompt doesn't even appear ). I guess I could get it with much more intense cooling, but actually I don't want to spend more money on the cooling than my whole system is worth .

    regarding the probe I think I have noticed that all progs that work (btw did u get Mobo Monitor to work with the GL monitor? I am using 'Hmon pro right now' but it's going to expire soon...) read the temp 4-6C lower than the BIOS reads (checked it with Sandra). How comes?



    ------------------
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

  8. #8
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    Hi there Ford Prefect,

    Sounds like you've got a good 400 there. My 400 will go +50 without any voltage change also. Temps seem fine, but cooler is always better. You can get Rain 2.0 (a software cooler) from my webpage

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  9. #9
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    My k6-III/400 runs 4x112@448 all day long and shows no sign of heat! It's on a va-503+. I can't get it to post at 124FSB though! But hey, it does the trick!

    My system bm'ed better with the higher bus!

    4*112@448 &gt; 4.5*100@450

    I have a 1M L3 cache, I am unfamiliar abut your board!





    ------------------


    grasshopper


    grasshopper

  10. #10
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    Sorry so long to reply!!!
    I haven't had any luck with MBM. I've used Hmon before, but as you have seen, it reads a little off. My temp probe shows that the GL Mon is the closest, on my systems anyway's. I alway's liked the GL Mon, so I never really spent any time trying to figure the other one's out. My Sandra always shows waaaay off though, so I don't trust her at all!

    As for more cooling, I understand not wanting to spend a lot on it! My cooling additions tended to add an additional $70 including HSF. But, a cheap mod is adding a suckhole and a blowhole. Use 80mm Sunon fans for both. Total cost is around $20 including finger guards. And they make a nice improvement in temps. Just a thought!

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  11. #11
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    Well Hmon reads a little of, but you can enter a correction value for that. Sandra reads the temp quite correctly on my system (at least it reads the same value as GL Mon does ), so I used it for finding the right value for Hmon. The reason I use Hmon is that, other than GL, it shows the current temp in a tray icon (or have I missed any updates for GL mon?), but as I said above, it's gonna expire the next days .

    As for the "not spending money" issue it's not the money of course, it was a joke. I just wanted to say I dont want to make a fuzz of it when I am already at a safe temp. Oh, I almost forgot, money IS the reason... I'm absolutely broke as I spent my last bucks on a final gfx card upgrade .

    btw it's 2 days now that my PC is running oc'ed (nearly all day long) and I found that the temp ranges between 28C when the PC is really really bored and 43C when I really stress it. I had no crashes whatsoever apart from the usual windows ones (like netscape crashing now and then), so I guess it's OK. I'll run the system for a few weeks and maybe then I'll get some better cooling and try to get more speed out of it, we'll see (If my PC starts up at all after I stick in my new gfx card .

    Oh one other thing: what's the best system of cooling an AT case (it doesn't have the well planned air flow of an ATX one right?), do you know any articles or stuff I can read about proper cooling?

    cheers, Ford

    ------------------
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

  12. #12
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    Wow I just realized I tend to post loooooooong replies
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

  13. #13
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    Sounds like she's pretty stable!

    Try this site for case mods for improved cooling: http://www.pyramid19.com/vh/index.htm
    Main DVD MM Rig:
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  14. #14
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    Yeah pretty stable, I like it . Thx for your quick answer!

    hey! that was a rather short reply huh?
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

  15. #15
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    Well I guess I'm getting somewhere... I re-setup my case and rewired all my components to get a perfect air flow (btw. I put my case cover back on, see my air flow thread http://discussions.hardwarecentral.com/Forum11/HTML/010056.html ). I also tried to bend up my temp probe, but it doesn't seem to touch the CPU even when it's bent up completely. However, I put a spot of thermal paste on it, should be good enough. I'd estimate that procedure lowered my temp alot.... the idle temp (well nearly idle... I'm writing and surfing and stuff ) is now 26-27C, was about 5C more before all that.... we'll see what I can do next!

    cya

    ------------------
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

    [This message has been edited by Ford Prefect (edited 08-16-2000).]
    There is an art, or rather, a knack to flying.
    The knack lies in learning how to throw yourself at the ground and miss.

    - The Hitchhiker's Guide To The Galaxy -

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