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DDR Drive Strength

Discussion in 'Overclocking & Cooling' started by KennyT772, Oct 17, 2007.

  1. KennyT772

    KennyT772 New Member

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    I'm trying to get my tracers running 300mhz orthos stable and I'm curious what the drive strength option in the bios does. Anyone Know?
     
  2. JC316

    JC316 Knows what makes you tick

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    Supposedly changes the input and output buffers or some crap like that, I messed with it on my Tforce 550 and never found any gains, or losses.
     
  3. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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    Hey kenny...just confirmed with Athlon as well and we both think you should set the drive strength to 8
     
  4. DRDNA

    DRDNA

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    I am almost certain that option in the DFI bios was to help with Booting and the dreaded COLD BUG ...like phase and the likes ...
     
  5. regan1985 New Member

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    i think your right, ive never changed it on my dfi board
     
  6. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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    I know if its set @ 4 or lower 3rd party apps read it as weak strength.
     
  7. DRDNA

    DRDNA

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    The only thing it may help with is booting if the PC is unable to boot to windows ...but again almost certain its in refrence to the COLD BUG...I leave that set to Auto.
     
  8. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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  9. DRDNA

    DRDNA

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    I remember readin on the old DFI forum but I just added a post over to the new DFI forum and it reads>>>> exactly what would we use the DRAM Drive Strength for ????? whay run anything other than auto? I thought I read some where it was suppose to help with cold bug issues? <<<is that correct? Is there a guid line for the DRAM Drive Strength settings?Any help would be appreciated.
    http://www.diy-street.com/forum/showthread.php?t=79364
    hopefully an update will be had
     
  10. mandelore

    mandelore New Member

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    on my board, for high ram overclocks a low drive strength must be used, so possibly try a lower than default setting
     
  11. sneekypeet

    sneekypeet Unpaid Babysitter Staff Member

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    good work...hopefully they get to you on this issue!!!!:respect:
     
  12. largon

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    Drive strength is a sort of a vDIMM.
    The "vDIMM" we all know is the operating voltage of the memory cells themselves located in the core of a RAM IC but vDIMM is not the only voltage influencing the RAM chip... Remember the structure of a DDR RAM IC... There's two clock frequencies inside the chip: one in the memory cells (½ of the rated I/O freq = 200MHz for DDR800, etc.) and one in the I/O buffers (400MHz for DDR800). Drive strength dictates the strength of the signal the memory controller uses to access (read/write) the I/O buffers.

    It is speculated that the IMC on AMD Hammer arch CPUs goes haywire when the core is under extreme cooling such as phase or liquid nitrogen. Increasing the drive strengths can help to keep the mem ctrl stable...
    To some extent.

    It is worth a notice that different DIMM slots on a motherboard are usually factory configured to use diff. drive strengths to compensate interference/differences in DIMM signal trace routings. This means manually setting strong drive strength may result in dangerous signaling voltages, consequently damaging the RAM/MC.
     
    regan1985, DRDNA and sneekypeet say thanks.
  13. DRDNA

    DRDNA

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    Very nice description largon! You the man;)
     
  14. KennyT772

    KennyT772 New Member

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    From what it seems the drive strength is the carrier voltage, or the change in voltage for signaling 0's and 1's. All digital devices use a high/low current for carrying the signal, the higher the drive strength the large the difference in voltages between 0 state and 1 state. From the looks of things the A64 imc has an issue with interpreting the stock voltage differential at very low temps, so this setting allows for correction.

    I'm still interested in what the various options actually set though.
     
  15. regan1985 New Member

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    just what i thought it was :)
     

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