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Thread: problem with memory voltage on EP45-DS3R




  1. #1
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    Default problem with memory voltage on EP45-DS3R

    Hi,
    I have a GIGABYTE board EP45-DS3R Bios F7
    I have 2 X 2GB of GSkill DDR2-800 PK that should run at 2.1V 4-4-4-12

    I've changed in the BIOS the memory voltage to 2.1V and the timings to 4-4-4-12
    when I reboot and go back to the bios, I get a message: THE SYSTEM HAS EXPERIANCED BOOT FAILURES BECAUSE OF OVERCLOCKING OR CHANGE TO VOLTAGE
    and while the volatage values remain as I set them, the old value are used and I get 1.88V and 5-5-5-15 timing (as can be seen in PC HEALTH or in CPU-Z)

    I did not do OC for the CPU.

    I tried the following:
    * one stick (each of them) - works fine with 2.1V
    * two sticks in different channels (not dual) - works fine with 2.1V
    * two sticks in dual channel - post fails and go back to 1.88V - works fine with 1.88V

    I tried both channels, and no go.

    any ideas?

    Thanks

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: problem with memory voltage on EP45-DS3R

    For 2x2GB you need to at least manually set Refresh to Act to 52-62 and you also need to add some +.1 or .15 MCH voltage

    After doing that 444-12 should work for you, in dual channel mode as long as you do not have your memory multiplier set to high

  3. #3
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    Default Re: problem with memory voltage on EP45-DS3R

    Thanks for the super quick reply.
    But, I'll need some more help, as Im not familiar with those parameters.
    where exactly do I find them?
    (I saw parameters called: MCH Core, MCH Reference and MCH/DRAM Reference - which one is it?
    and can't find/understand the "set Refresh to Act to 52-62" )

    sorry... and thanks again.

  4. #4
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    Default Re: problem with memory voltage on EP45-DS3R

    No Problem

    You want to add a bit to MCH core, like if it is 1.1 try 1.2 or 1.25

    Refresh to act Is likely called tRfc it will be in the MIT section should be below your main 444-12 area. You wont be able to manually set it until you set DRAM Timing Selectable_______ SPD __ to >>> [Manual]

  5. #5
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    Default Re: problem with memory voltage on EP45-DS3R

    I changed the MCH core to 1.2 (from 1.1) and also to 1.24
    the tRfc was 52 on auto (and I also tried 58)
    still loops 2-3 boots w/o posting and when I it gets back to the bios its the 1.88V

  6. #6
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    Default Re: problem with memory voltage on EP45-DS3R

    Try 62 for tRfc and 1.3 for MCH

    Are you only trying 800MHz right now? If so, try it with 555-15 for now until we can figure this out

  7. #7
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    Default Re: problem with memory voltage on EP45-DS3R

    yes, I'm trying 800MHZ - no OC or anything. followed memory specs.
    After it fails at 4-4-4-12 2.1V is seems work fine at lower voltage and timings, as when I boot to Vista cpu-z/et6 show 1.8V 5-5-5-15 timings
    and the (not aggresive) stability tests I've done (memtest82, Everest) had no problems.

    I'll try 62/1.3 and report back soon.

    Thanks.

  8. #8
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    Default Re: problem with memory voltage on EP45-DS3R

    tried 62 for tRfc and 1.3 for MCH - same as before (repeated boots and finally posts with 1.88v)

  9. #9
    Lsdmeasap's Avatar
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    Default Re: problem with memory voltage on EP45-DS3R

    Ok, did you previously have a older CPU in there? What BIOS version is loaded in there, you can see by hitting F9 on the MAIN page of the BIOS

    What CPU are your using? A double or triple boot means something is not correct in settings is all

  10. #10
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    Default Re: problem with memory voltage on EP45-DS3R

    this is a new PC
    CPU is E8400
    bios F7

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