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Thread: BIOS Settings: GA-990FXA-UD3, AMD PHENOM II X6 1075T 3.0GHZ, & F3-12800CL8D-8GBXM RAM




  1. #1
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    Question BIOS Settings: GA-990FXA-UD3, AMD PHENOM II X6 1075T 3.0GHZ, & F3-12800CL8D-8GBXM RAM

    Hello:

    I have just put together a new system with the subject parts (motherboard, CPU, and RAM) and I am trying to set everything first to just their specified settings (CPU - 3.0 GHz with Turbo 3.5GHz; RAM - 1600GHz with 8-8-8-24-2N). Unfortunately, I assumed the BIOS would take care of that but it hasn't. The BIOS speaks of "Set Memory Clock" and then uses X4.00, X5.33, X6.66, & X8.00 but I can't make heads nor tails of what this means.

    Any help will be most appreciated!

    Thank you in advance.

    Sparky

  2. #2
    Chike is offline Senior Member
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    Default Re: BIOS Settings: GA-990FXA-UD3, AMD PHENOM II X6 1075T 3.0GHZ, & F3-12800CL8D-8GBXM

    The memory clock is half the double data rate, which in your case is 1600, so the clock should be 800.
    The memory clock is the result of FSB(200MHz) times memory-multiplier, so you need x8.00.

    Set memory-multipler x8.00, timings 8-8-8-24, DRAM Voltage 1.5-1.575v.
    For high speed memory and/or large capacity it is almost certain you will need to increase CPU NB VID Control. Increase it gradually if needed, but don't exceed 1.35v.
    Make a memtest86+ bootable USB flash-drive, and run a few passes before running windows.
    In windows run a Prime95 blend torture for 6-8 hours to make sure the system is stable.

    This memory is designed for Intel P67/Z68 chipsets, lets hopeit works for you.
    For a significant increase in memory performance you will have to set higher FSB(overclock).

  3. #3
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    Thumbs up Re: BIOS Settings: GA-990FXA-UD3, AMD PHENOM II X6 1075T 3.0GHZ, & F3-12800CL8D-8GBXM

    Hello, Chike:

    First I want to thank you for all of the information - it was exactly what I needed to know!

    Then, regarding the memory, I had asked your question of G.Skill because all of their adverts listed the memory as being "Designed For 2nd Generation Intel® Core™ Processors". The reply:

    Yes, they will work just fine for AMD platforms. The reason we state for Intel is because Intel has a special XMP profile that we embed for the latest processors. One simple setting in BIOS can configure high performance memory. With the new AMD platforms, they are still in the beginning stages, so generally most AMD users still need to use manual settings in BIOS.

    So, on the strength of that answer I bought 8GB worth of 4GB modules - they seem to work just fine!

    Now, to the settings - I used the settings that you proposed - but didn't change any of voltages - ran two cycles of MemTest86+ without a problem.

    Then I began to wonder about the "1T/2T Command Timing" which you didn't address. So, I ran a Sandra Memory test (got 12.338 GB/s at 2T and 12.660 GB/s at 1T) so I've left it at 1T, I ran an additional pass through MemTest86+ with out error, so I guess I'm happy!

    The times that I stress my system is doing Video Processing - that used to take a looooong time - I am anxious to compare that with my new system!

    Many thanks for the advice - if there's other things you think I should try without danger of bricking something, please let me know!!

    Kind regards,

    Sparky

  4. #4
    Chike is offline Senior Member
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    Default Re: BIOS Settings: GA-990FXA-UD3, AMD PHENOM II X6 1075T 3.0GHZ, & F3-12800CL8D-8GBXM

    Nice to see you are doing OK without changing voltages. Check the BIOS HW Monitor, it may be already over volting the memory.
    I till recommend running Prime95 blend torture for 6+ hours You can customize the blend to run each test 8-10 minutes only to run more tests.

    Don't put high expectations in video encoding improvement, you will see a minor improvement at best. Memory has not much impact on performance, especially in well optimized software.

    If you wish to overclock you may get much better results. It's a little risky, but if you do it right and don't push anything to extreme it usually pay up.

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