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Prime95 fails after 12.5 hours? Should I up the voltage again or is it stable?

Discussion in 'AMD Overclocking' started by Eternally, Feb 4, 2004.

  1. Eternally

    Eternally Guest

    Hey,

    Just a quick question. OC'ed processor from 2500 to 3200. Upped the
    voltage to 1.7 because of Prime95 failing after a few minutes. At 1.7 volts,
    Prime95 ran for 12.5 hours and then stopped with a rounding error.

    Should I up the voltage again, or if it ran for that long, does it mean it's
    stable, and that was some sort of fluke?

    I'm pushing the temperatures though, so I'm a little hesitant. It's as low
    as 45 degrees Celsius when idle, but as high as 57 degrees under full load.

    What would you guys do? Should I instead lower the FSB by 10 or so?

    Thanks for the advice!
     
    Eternally, Feb 4, 2004
    #1
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  2. Eternally

    CoCo Guest

    hi

    i have a 2500 @ 2300 and i got some errors also in prime95 but after i
    updated to last version they dissappeared. (23.7.1)
    you may try to lower fulload temp. i would continue with the test before
    upping vcore any more, if only few errors show up some hours apart
    then.....depends on what you want! errorfree or just stable enough.

    coco
     
    CoCo, Feb 4, 2004
    #2
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  3. Eternally

    Eternally Guest


    Well I guess it depends on what this error really means. Does it mean that
    if I run a program which uses the CPU full load for longer then 12 hours,
    it'll probably crash? If so, then it's not stable enough. I want to be
    able to encode video and stuff which can take that long.

    If it doesn't mean that, then what does this prime95 rounding error really
    translate into?
     
    Eternally, Feb 4, 2004
    #3
  4. Eternally

    BigBadger Guest

    There are no 'real world' programs that would hold your CPU at full load for
    12 hours...so you be pretty sure there wont be a problem
     
    BigBadger, Feb 4, 2004
    #4
  5. Eternally

    CoCo Guest

    hi

    prime95 use continous floatingpoint calculations and checks the in and out
    values vs the rest from the operation all the time and will detect nearly
    any kind of computing error. this is a continous operation and video
    encoding is not! (video encoding values does not depend on each other for
    hour after hour)

    coco
     
    CoCo, Feb 4, 2004
    #5
  6. Eternally

    DaveL Guest

    Then why don't you try some video encoding over night and see what happens?

    Dave
     
    DaveL, Feb 4, 2004
    #6
  7. Eternally

    Wes Newell Guest

    If 57C socket temp. that's too high when trying to reach higher speeds. If
    it's the core temp, then it's probably ok.
    I don't know. Do you have a UPS? Could a power glitch have caused the
    problem? All my machines are behind a ups. If you value your data, you
    will have one too. What cpu cooler do you have? If it's the stock cooler
    it isn't good enough with the increased speed/voltage. At minimum, get
    something comparable to a Vantec Areoflow. What's your case temp? Ambient
    room temp? All these will affect cpu temp and the stability of the system.
    400WPS? Are you sure your ram is stable at 200Mhz? Etc. 12hours without an
    error is pretty good, but I'd want to know what caused the error even if
    it was just one, and about all you can do is try and find the weak spot.
    More voltage may fix it, but you need to keep temps down too. Good luck.
     
    Wes Newell, Feb 4, 2004
    #7
  8. load.


    Hi,

    everyone has different standards, but I myself like to run Prime95 for a
    minimum of 24Hours (48 if I'm away). I have a 2500+ @ 2.2GHz but it won't
    last 24 hours *Priming* without 1.775vCore. My max load temp so far has
    been 58°c.

    One thing you can do is make sure you have a decent cooler and also use a
    good thermal-paste. One things that helps allot is ensuring your case has
    proper ventilation. If you can bring your case temps down by 5°c, you will
    see that your CPU temps drops by 5°c also. Allot of people run their
    overclocked rigs with the doors off (or completely spread out on a table!).

    Here is the spec of my last AMD machine (just sold!)
    --
    Wayne ][

    Barton (AQXEA) XP2500+ @ 2.2GHz (10x220) - 1.775vCore
    CoolerMaster Aero 7 Lite - 3,200rpm
    ABIT NF7-S v2.0 (BIOS d20)
    512MB Dual TwiSTER PC3500 @ DDR440 1:1 (2.0,3,3,9 - 2.8v)
    Sapphire Atlantis 9800 - 3.3ns Samsung (325/290 Default)
    WD-SE 240GB (2x120GB) SATA RAID-0 (NTFS - 16k Stripe)
    Antec SX630II Mini-Tower Case Inc 300w PSU
    2 x CoolerMaster 80mm Blue Neon Fans
    WinXP PRO inc. SP1
    nVidia Unified v3.13
    Cat 3.7 - DX9.0b
     
    Wayne Youngman, Feb 4, 2004
    #8
  9. Eternally

    NewUser001 Guest

    prime95 for 12 hours is great. my pc is rock stable (on 24/7 and i play a
    lot of grafx intense games. prime95 fails on my always 45 min- 1 hr. so draw
    ur own conclusions
     
    NewUser001, Feb 4, 2004
    #9
  10. | Hey,
    |
    | Just a quick question. OC'ed processor from 2500 to 3200. Upped the
    | voltage to 1.7 because of Prime95 failing after a few minutes. At 1.7
    volts,
    | Prime95 ran for 12.5 hours and then stopped with a rounding error.
    |
    | Should I up the voltage again, or if it ran for that long, does it mean
    it's
    | stable, and that was some sort of fluke?
    |
    | I'm pushing the temperatures though, so I'm a little hesitant. It's as
    low
    | as 45 degrees Celsius when idle, but as high as 57 degrees under full
    load.
    |
    | What would you guys do? Should I instead lower the FSB by 10 or so?
    |
    | Thanks for the advice!
    |


    12.5 hours isn't bad, but for a perfectly stable, properly configured
    system, it should run the test infinitely with no problems. I would think,
    though, that it is unlikely you would be taxing your CPU for that hard for
    that long at any time, so yo will likely be ok. My personal satisfaction
    level is 24 hours, since I do some rendering that keeps the CPU busy for
    12-15 hours at times, but that's just my picky personal preference.
     
    Jason Cothran, Feb 5, 2004
    #10
  11. Eternally

    Geoff Guest

    wanna bet? :)
    all my cpu's run 100% all the time....
     
    Geoff, Feb 5, 2004
    #11
  12. Eternally

    Geoff Guest

    you prob should give it a little more voltage
    my xp2500 @ 3200 runs at:
    1.725v
    case 20c
    cpu: 45c

    i'v got myself some good cooling now though
    i'd say max temp is about 55c at 100%
    if it goes that high, you should be looking at getting it lower, 50c max i'd
    say if you can get it

    how did i get 45c ?
    i went to local diy place last week and bought myself a bathroom extracter
    fan and flex tubing
    put the fan on the window sill, put end of tube right in front of the cpu
    fan
    rock along now :)
    also gave my heatsink a clean, it was full of dust doh :/
     
    Geoff, Feb 5, 2004
    #12
  13. Eternally

    BigBadger Guest

    And what real-word prog does that.......????? Seti, Folding???? I don't
    count them as 'real world'...maybe you do..that's fine.
     
    BigBadger, Feb 5, 2004
    #13
  14. Eternally

    boostland Guest

    I have had 3d studio max render for over two weeks on my dual AMD 3000, and
    a few 3 week terragen renders that were running on two dual cpu systems.
    They are "real world programs".
    Folding@ home also runs on these two systems 24/7 when they are not
    rendering.
     
    boostland, Feb 6, 2004
    #14


  15. Yup that sounds about right. Some people never heard of *Render Farms*. I
    wish posters would state there opinion rather than making a statement out to
    be matter of *Fact*.

    If they are happy for their Prime95 to fail after a few hours and still call
    the machine stable, that affects no-one else except them. I like a machine
    to Prime95 for 48 hours while running a 3D loop as well, so I know where
    your coming from. . . .
     
    Wayne Youngman, Feb 6, 2004
    #15
  16. Eternally

    BigBadger Guest

    I'm sure that if the original poster was running a 'Render farm' system he'd
    have said so....However, I stand corrected, there are specialist
    applications that will stress your system indefinitely...but for 99.99% of
    PC users Prime stable for 12 hours is fine...In any case due to the fact
    that Prime detects errors that rendering would miss, Prime stable for 12
    hours would probably be fine even for a render farm system.
     
    BigBadger, Feb 6, 2004
    #16

  17. Hi,
    I wasn't having a dig at you, just pointing out that there are all kinds of
    *Power-PC users*. I suppose I am a bit *obsessive* with any PC's that I
    build, but 48hour Prime95 is what I do to be happy that my build is *ROCK!*

    Really the word *Stable* is subjective, what is stable for you, isn't stable
    for me, what is stable for the average Joe probably isn't stable for you :p

    Look at the Subject:
    "Prime95 fails after 12.5 hours? Should I up the voltage again or is it
    stable?"

    Really none of us can answer that question, it's up to each person to decide
    if a build is stable. From what I seen on my travels, 80% of people get by
    using Flaky machine. . . .
     
    Wayne Youngman, Feb 6, 2004
    #17
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