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Thread: Auto setting overvolting RAM? GA-P55A-UD3R

  1. #1
    Join Date
    Jul 2008

    Default Auto setting overvolting RAM? GA-P55A-UD3R

    To the Gigabyte knowledgeable :

    I have some new Kingston DDR3-1600 RAM which is spec'd to run at 1600MHz @ 1.5V. It has 3 JEDEC SPD profiles that I can see (this is not XMP RAM).

    DDR3-1600 [9-9-9-27] @ 1.5V
    DDR3-1333 [8-8-8-24] @ 1.5V
    DDR3-1066 [7-7-7-20] @ 1.5V

    When I load BIOS defaults on my GA-P55A-UD3R + i7-870, it runs at DDR3-1600 (as expected, as the i7-800 series has the 12x memory multiplier). Voltage in the BIOS is set [Auto] though the Health section reports the voltage to be 1.61-1.62V

    I experimented a little and changed the memory multiplier only:

    (auto) 12x (1600MHz): ~1.61V as above
    10x (1333MHz): ~1.58V
    8x (1066MHz): ~1.55V
    6x (didn't try yet)

    So from the above, it appears that the Gigabyte P55A-UD3R over-compensates the voltage a bit. I have changed the DRAM voltage from [Auto] to 1.50 and now the Health reports ~1.53V. Testing has shown no issues so far.

    How dangerous is ~1.61V when left on Auto for RAM that's rated at 1.5V?

    Is it likely to be a remnant of when the BIOS was made, in which during this period of time, modules running at 1600MHz were unheard of running at 1.5V, so the BIOS is kind of assuming it's standard stuff requiring ~ 1.65V, and hence it compensates when on Auto?


  2. #2
    Acebmxer's Avatar
    Acebmxer is offline Gigabyte Elite
    Join Date
    May 2009
    New Jersey, United States

    Default Re: Auto setting overvolting RAM? GA-P55A-UD3R

    If you see that Auto voltage is over volting then doing us it. It is never suggested that Main voltages never be set to auto. Always manually set your voltages. If your ram is rated at 1.5v set 1.5v in bios or close to it. If you need 1.6v for ram set 1.6. or 1.62v.

    Main voltages that need to be set manually are Vcore, Qpi/vtt, and vdimm. Most others can be left on auto to a point.
    Main Rig
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    Samsung Green 8GB 2x4GB MV-3V4G3D/US DDR3 1.3v 30nn @ 2200Mhz 11-11-11-32 1.60v
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  3. #3
    Chike is online now Senior Member
    Join Date
    Jun 2009

    Default Re: Auto setting overvolting RAM? GA-P55A-UD3R

    BIOS always attempt to "help" with DRAM Voltage, in older boards too.
    EasyTune -> Tuner -> Advanced -> Voltaeg tab targets will show you what BIOS set for auto.
    Either r both, BIOS setting or the reading sensor may be inaccurate.
    My guess is that for the 1.61v BIOS attempt to set 1.575, which is still within the standard specs.

  4. #4
    Join Date
    Jul 2008

    Default Re: Auto setting overvolting RAM? GA-P55A-UD3R

    Thanks guys

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