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F3-14900CL9D-8GBXL and Gigabyte A75M-UD2H

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  • F3-14900CL9D-8GBXL and Gigabyte A75M-UD2H

    Hi all,

    I just purchased a new Gigabyte Gigabyte A75M-UD2H (AMD Socket FM1 board), an AMD A8-3850 CPU, along with a single F3-14900CL9D-8GBXL kit, for 8GB RAM total. BIOS is updated to version F3 (7/12/2011).

    I have found by setting the ram speed manually to 1866 and the memory timings manually as well, that I have a stable system. I have not had to change the RAM voltage from AUTO so far.

    I set the Memory Clock to x9.33 (1866 MHz).

    Memory timings are as follows:

    Command Timing: 2T
    CAS# Latency: 9T
    RAS to CAS: 10T
    Row Precharge: 9T
    Minimum RAS Active: 28T
    TwTr command Delay: 8T
    Trcf0 and Trfc1: 160ns
    Write Recovery Time: 16T
    Precharge Time: 8T
    Row Cycle Time: 42T
    RAS to RAS: 6T
    Four Bank Activate Windows: 20T
    Bank Interleaving: Enabled

    I've run memtest86+ for 20 hours with no errors using this config. I've found Windows to be stable.
    I noticed that I had to set both the RAM MHz and the memory settings at the same time. If I did just one change and rebooted then the motherboard would reject the settings and go back to defaults. So it seems that both the RAM clock speed and timings should be set simultaneously to take effect.

    -amigaguy

  • #2
    Thank you for posting your feedback and results.

    DRAM Voltage AUTO can work, but it is always best to set manually.

    Write Recovery Time is quite high, you may want to try lowering that to 12T or 14T for slightly quicker latency.

    Otherwise, glad to hear it is working well!

    Enjoy!

    Thank you
    GSKILL TECH

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    • #3
      update

      Thanks for the recommendation. I've had Write Recovery Time at 12T for a few days now and it is stable.

      Do you have any other recommendations no possible faster timings that you know other people have found stable at 1866MHz? I know not all mobo are the same, so I will update here on anything I try.

      Regarding automatic vs manual voltage. In Automatic mode, the motherboard reported it was running the RAM at 1.504 volts. I have switched the setting to Manual mode, and set manual to 1.505 volts, which the motherboard also reports at 1.504 volts. So it looks like on this motherboard manually setting it to 1.505 volts is stable for me.

      -amigaguy

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      • #4
        That's about it, we just want to make sure you're getting the max rated performance that you paid for. It doesn't make a huge difference like booting 2 minutes faster, but it's something your memory is easily capable and rated for.

        You can always raise voltage and try to lower timings, but that would be on your own. Each kit can slightly differ from here, so I can't give you more performance settings that are guaranteed to just work, but the fun part begins from here. You may have a kit much more capable than another, or less capable, so this is when you need to decide whether you are a memory overclocker or not.

        Thank you
        GSKILL TECH

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