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  1. #1
    Joined
    Nov 2001
    Age
    36
    Posts
    168

    Exclamation A7N8X v2.0 + 3C920B-EMB = Low Efficiency S2K Bus Disconnect

    There is some time I was noticing the inefficiency of S2K Bus Disconnect function (same when enabled) in A7N8X v2.0 Deluxe, then I solved to do an investigation to try to discover what could be causing this problem. I noticed that the CPU temperature was static every instant and it didn't decrease when in "idle" mode:







    As I always used 3Com 3C920B-EMB Integrated Fast Ethernet Controller (driver 4.31.0.0), I did not suspect that he impeded the complete Bus Disconnect. However it was not only this, I also discovered that the Offset 6F (default 9F) it presents a better efficiency when adjusted in 1F:






  2. #2
    Joined
    Apr 2001
    Location
    Los Angeles
    Posts
    21,105
    Thanks TheEnigma, nice work.

    I wonder what would occur if you have made a comparison with the AC97 sound disabled and enabled?

  3. #3
    Joined
    Nov 2001
    Age
    36
    Posts
    168
    The results are apparently equal.

  4. #4
    Joined
    Nov 2001
    Age
    36
    Posts
    168
    I updated the current reading of the CPU temps:


  5. #5
    Joined
    Dec 2002
    Posts
    39
    the same prob occurs, when i plug in any usb2.0 device.
    tried it with an epson 1670 photo usb2.0 scanner, with a 6 in 1 card reader and an external usb2.0 harddrive.

    when connected, diode temp rises to 52C, after disconnecting temp falls to 38 - 39C.

    offset 6F is default at 9F.

    just wanted to share this.

    juberg.

    !!! Happy new Year to everyone !!!
    Asus A7N8X dlx rev. 2.0 1004 uber
    Athlon XP 2500+ @ 3200+ (11x200) 1.70V, alpha8045 cooling
    Leadtek GF4 Ti 4400
    2x512MB Corsair CMX512-3200LL; 11,2,3,2 @ 2.6V
    WinXP pro

  6. #6
    Joined
    Nov 2001
    Age
    36
    Posts
    168
    juberg,

    Try change offset 6F to 1F and install Hotfix KB KB822603.

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