KT7A v1.2 A9, Thorton 2000MHZ + 133FSB/15x multiplier ???

Discussion in 'Abit' started by Tom Goodman, Sep 9, 2005.

  1. Tom Goodman

    Tom Goodman Guest

    I'm using a Thorton 2400 which boots at 2000MHZ, and with the only (?)
    useable setting of "above12X", I think, the FSB runs at 100MHZ, giving
    an actual multiplier of 20x, verified by CPUID.

    I'd like to use 15x with 133MHZ FSB to get better performance with
    cetain applications.

    I noticed some time (couple of years ?) ago jumpering diagrams for the
    CPU socket to allow the necessary FSB multiplier.

    Forgot to save these, or haver lost them !

    If anybody can direct me to the correct info I'll be most grateful. I'm
    quite satisfied still with the ABIT KT7A, having bios A9 u.g. done and
    don't see the need to junk it yet.

    Replies gratefully received,

    Thanks in advance,


    (Not too interested in trying the 256K-512K cache mod, seems a bit
    tricky, and instructions can't be found-or can they ? Overclockers ru
    english version which I looked at has gone...)
    Tom Goodman

    West London Wildlife Group
    Regd. Charity No. 295834

    Mob: 077 806 22 070
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    Tom Goodman, Sep 9, 2005
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  2. Tom Goodman

    Wes Newell Guest

    Check my server below. The mods are in the Multiplier Cross ref. section.
    17x (9x in bios) will work with a 133MHz fsb without mods, but for 2266MHz
    you will probably need to raise vcore to about 1.70v.
    They can be found. May be here. But I thought AMD starting locking that

    Wes Newell, Sep 9, 2005
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  3. Tom Goodman

    Tom Goodman Guest

    You are a WIZARD !

    Now running 133MHZ FSB x 9 in bios= actual 17x=2266.7MHZ; I put vcore up
    to 1.70v in bios, and theother voltage setting from 3.2v to 3.6v just to
    be safe (not sure what it does).

    CPU-Z indicates 2266.7 MHZ, 17x multiplier of 133.3 MHZ, bus speed of
    266.7 MHZ, and it detects vcore of 1.682 volts a bit less than I set in
    bios, don't know why. MBM now shows 48C idling, and only 51C after
    running CPU Bench 2003.
    I got a blue screen and a memory dump after the first boot and attempt
    to run a program, but this seems to be "normal" with XP Pro and NTFS,
    subsequent boot ok as expected. No idea why this happens, but suspect
    interaction with Zone Alarm/permissions.

    Anyhow, all running smoothly with a painless >10% overclocking included

    I'm tempted to look into the 256-512 cache mod, as this ought to improve
    performance still further (but by how much approx ?)

    No I can implement the Nebula Digitv update to 3.5 beta which included
    the ability to watch one program whilst recording (to MPEG2, the
    broadcast compresion) another in the same multiplexed data stream. They
    reckon a 2000MHZ Athlon XP would be the min spec, and I didn't think a
    measly 100MHZ bus speed would be much good.

    Sincere thanks,

    Tom Goodman.
    Tom Goodman, Sep 9, 2005
  4. Tom Goodman

    Wes Newell Guest

    It all depends on the type app you run. Itf the app uses the extra cache,
    it will be sped up. If it doesn't there will actually be a slowdown
    because of the overhaed of the extra cache. Overall, I'd estimate about
    2-3% increase.
    Wes Newell, Sep 10, 2005
  5. Tom Goodman

    Tom Goodman Guest

    Oh, well, in that case 2-3% hardly seems worth the risks and hassle
    involved in pulling out the CPU, jumpering it, (still don't have the
    connections) etc. The machine is running like a train now, and I've just
    put in a 5 port USB 2 card to speed up peripheral work. I'll be keeping
    the KT7A for some time now !

    But, one wonders, if there is such a small gain, and possible slowup due
    to overheads, why AMD bother with the 512 cache in the first place. It's
    big chunk of silicon...

    Tom Goodman, Sep 10, 2005
  6. Tom Goodman

    Wes Newell Guest

    It's an easy way to get just a little more out of the core. Adding the
    extra cache is a simple matter compared to designing a new core, which
    they aready had in the works with the K8.
    Wes Newell, Sep 11, 2005
  7. Tom Goodman

    Tom Goodman Guest

    I see.
    Still, I can't find the link for the wiring to try and get the 512 cache
    anyhow, so I'll just stay the present improvement.

    I have a further problem that I've not mentioned because I don't know
    what the cause is and I'm reluctant to post in the wrong group. The
    whole system "locks up" and neither keyboard or mouse respond. Reset is
    necessary. If digital tv card is operative, then I notice CPU %
    fluctuate and creep up to 100% in windows task manager, then the lock
    up. sound sometimes "stutters" and the system locks up. (SB Live! card).
    No overheating according to MBM, all drivers up-to-date and I suspect
    hardware, but don't know how to start looking really. Sapphire Radeon
    9200SE, DXdiag reports all ok. I've two 512MB memory modules and I
    wonder of I should start by suspecting them ? Perhaps take one out at a
    time and swap slots around. Memtest seems a recommended program, but I
    see it can indicate faults which might not actually occur under "normal"
    operating conditions. Replacing the whole 1GB of memory would cost about
    £170, an expensive option. Where to start ? Software tests abound, but
    hardware diagnostics seem thin on the ground.

    Tom Goodman, Sep 11, 2005
  8. You do not say what operating system you are using. There are memory
    considerations when the memory exceeds 512 MB in Windows ME and 98. See

    Nicholas D Richards, Sep 11, 2005
  9. Tom Goodman

    Tom Goodman Guest

    Sorry ! I should have said XP Pro SP2 updated to present.
    Tom Goodman, Sep 11, 2005
  10. That is OK. Then the amount of memory should not be a problem.

    Are you using a USB Mouse and/or keyboard?. There was/is a problem with
    the USB through the Via chipset. The symptom was that USB devices would
    freeze up although non-USB processing would continue normally.

    There were many solutions suggested most of which did not work for me
    until I installed a USB card that did not use a Via chipset. I am
    posting this from that KT7A board, firmware A9 using an Athlon at 1200
    MHz. The operating system is ME.

    The other solution that worked was to disable ACPI, which involved a
    registry hack and a lot of hassle to get it working. This is no use to
    you as I suspect the registry hack is not available in XP.
    Nicholas D Richards, Sep 11, 2005
  11. Tom Goodman

    Wes Newell Guest

    First place to start would be memtest. If that goes ok, then run Prime 95.
    If that goes ok, I'd say you had a software problem with either the sound
    card or tv card. Might try a Linux live CD like knoppix and see if it
    crashes on you too.
    Wes Newell, Sep 12, 2005
  12. Tom Goodman

    Tom Goodman Guest

    Thanks for that, Wes, I have knoppix and I'll see waht that does.
    Before that I'll give memtest and prime 95 a blast.
    Ran chkdsk /f and fixed an error relating to non-paged areas being paged.
    Have "cleaned up" registry with Ashampoo, tweak now, and ace
    utilities-hoping I've not blatted anything i shoulden't have.
    Defragmented "C" completely as to space and going to run tests now.
    Tom Goodman, Sep 12, 2005
  13. Tom Goodman

    - HAL9000 Guest

    I have an old ATI pci video/tv card that does this (system lock ups)
    with winxp. Every driver/software version I have tried, over the past
    5 years, for the card has had various forms of major defects. I
    haven't bought anything else from ATI since.

    One thing to try would be to remove the tv card and see if your
    problems go away.


    Motherboard Help By HAL web site:

    < snip >
    - HAL9000, Sep 12, 2005
  14. Tom Goodman

    Tom Goodman Guest

    Dear Wes,

    Following your advice I've booted into Memtest and run 6 hours of
    iterations of the test suite, followed by two complete iterations of the
    fading bit test, and I'm glad to say that no errors were reported ! The
    expense of replacing 1GB of memory seems less likely.

    I don't yet have Prime95 but that will be the next thing to try.

    After that I'll give Knopix a whiz, though I doubt it will recognise the
    TV card or have a program for it.

    I'll also be uninstalling software which I hardly ever use just in case
    that might be causing problems.

    I'm suspecting the Radeon 9200SE card, although I'm using the latest
    catalyst drivers. I'm inclined to spend a bit on a better video card,
    Nvidia based for a complete change and see if that will help. Problem is
    the Radeon has no fan so is silent. I'm not sure that there is a fanless
    Nvidia based card suitable for this motherboard voltage and I DON'T want
    NOISE-I live in a quiet flat and I hate intrusive machinery. I've gone
    to a quietPC power supply for that reason

    Tom Goodman, Sep 15, 2005
  15. Tom Goodman

    Tom Goodman Guest

    Your advice produced results rapidly: Prime95 failed in less than one
    minute using a variety of configurations !
    I'm now inclined to suspect the CPU.
    There has been no noticeable extra deterioration since overclocking the
    Thorton from 2000MHZto 2266MHZ, and upping the bus speed from 100MHZ to
    The cheapest first option will be to replace the overclocked "Thorton
    2400" with something that will run at 2266MHZ without overclocking. If I
    can now get a suitable CPU of course.
    Would you have a recommendation ?

    Once again,

    Tom Goodman, Sep 15, 2005
  16. Tom Goodman

    Tom Goodman Guest

    Looking at a reply to an earlier poster, it seems that a mobile AthlonXP
    would be better than an AthlonXP 3200+.
    Because the internal multiplier is not locked. (Hard or not possible to
    unlock the XP multiplier).

    Would I be correct in thinking that the XP-M 2600+ would be the better
    chio, with 133/266 FSB as standard and no multiplier locking ?

    Tom Goodman, Sep 15, 2005
  17. Tom Goodman

    Tom Goodman Guest

    Looking at earlier posts I've ordered up an Athlon XP-M 2600+ from
    overclockersUk, and I think that will fit the bill. Of course, it's
    expensive compared to the USA price, £94.00 including postage +
    insurance; USA price was about $75 excl, the lowest I could find.

    I'm looking forward to testing the rig with this chip in !

    Tom Goodman, Sep 15, 2005
  18. Tom Goodman

    Wes Newell Guest

    If you need performance of a socket a 2266Mhz, you'd be better off selling
    your current MB/cpu combo and going to a socket 754 Sempron or A64 2800.
    Wes Newell, Sep 15, 2005
  19. Tom Goodman

    Tom Goodman Guest

    Well, I would not feel happy selling a "dud" CPU, and apart from the
    current problem I'm quite happy at the moment with the KT7A. So I think
    if the Mobile XP works it's the better option. I'd also need to buy
    another 1GB of ram since the PC133 would hardly do in a more modern board.

    If the replacement CPU doesn't cure the bug(s) I'll consider the board
    dud probably, then I'll look for another one to take the existing
    CPU/ram and hardware. ANY SUGGESTION ?

    Actually I have built an alternative system based on MSI KT6 Delta, with
    Athlon XP 3500+ and 1GB of memory. In due course that will become my
    main machine, hardware and software transferred to it, and the KT7A will
    be retired. The only thing stopping me is that I have had several
    ocurrences of XP Pro failing to boot because files have become corrupted
    or missing ! I have had to do several recoveries and reinstalls and have
    not got to the bottom of the problem yet. Twin Seagate Barracuda 250GB
    7200 seem to be ok, memory tests ok. I suspect XP...but haven't finished

    At present the KT6 box has a Suse Linux 9.3 Pro installed by ftp, and it
    doesen't seem to suffer the same problem as it did under XP pro. It
    boots every time and doesn't seem to suffer file corruption-or if it
    does the system recovers itself automatically. I therefore strongly
    suspect that for some reason the XP pro system/drivers can't handle this
    mobo/ram/drives combination.

    And further, under XP I can update the mobo drivers etc; with Linux I
    can't because the checking/updating programs are Microsnot Windoze only
    ! So even with this limitation Linux has proved far superior. If I could
    run the Nebula DigiTV card under Suse, I would think of dropping
    windoze-although I have many programs I'm loath to part with.

    Best wishes,
    Tom Goodman, Sep 16, 2005
  20. Tom Goodman

    Wes Newell Guest

    There aren't many boards left that will take non ddr ram. You migt see if
    you can find a K7S5A or one of the boards using a KT266A chipset. Either
    way though, you're limted to 2 sdram on these. If you have more than 2
    sdram sticks, you're stuck with an older chipset like the KT133A you have
    Wes Newell, Sep 16, 2005
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