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Thread: Will ram work proporly? its not in the aproved "memory support list"




  1. #11
    parsec's Avatar
    parsec is offline Senior Member
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    Default Re: Will ram work proporly? its not in the aproved "memory support list"

    New memory always starts at the default speed, which should be 1600 on a Z77 Ex4. To get the highest speed, you must set it either manually, or using the XMP setting in the UEFI.

    If you use the XMP setting, the voltage should be set for you. On a Z77 board, the CPU and RAM speeds are separate settings, but they do share the BCLK. Standard BCLK is 100MHz, and cannot be changed much at all, don't bother changing it unless you are a experienced over clocker. It won't go above 105MHz without a BSOD anyway. This board does not let you adjust the memory multiplier directly, you can only select speeds, but the standard ones are all there, up to 2800 or so.

    Be careful changing RAM voltage on any newer Intel CPU board, that can damage the memory controller on the CPU. The lower the voltage the better, IMO. I think the max memory voltage on an IB CPU/board is 1.5V, if not it is 1.65V. I use the new Samsung memory, which I can run at 2000 with 1.35V. The XMP data shows 1.28V!

  2. #12
    Babdi is offline Junior Member
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    Default Re: Will ram work proporly? its not in the aproved "memory support list"

    Quote Originally Posted by parsec View Post
    New memory always starts at the default speed, which should be 1600 on a Z77 Ex4. To get the highest speed, you must set it either manually, or using the XMP setting in the UEFI.
    Parsec
    When I booted my EX6 first time with 1600,16GB G-skill RAM it defaulted to 1333 Mhz with BIOS 1.70 and UEFI default.
    I tried after upgrading to BIOS 1.90 which still sets the RAM to 1333 when loaded with UEFI default.
    Speed is the limit

  3. #13
    parsec's Avatar
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    Default Re: Will ram work proporly? its not in the aproved "memory support list"

    The 1333 or 1600 speed depends on the default SPD data of the memory. I should have said 1333 or 1600 as the default speed, for higher performance memory. Sandy Bridge CPUs are rated by Intel for 1066 - 1333 speed memory, and Ivy Bridge moved to 1333 - 1600. So with memory that will work with both of those CPUs/platforms, the default SPD data is usually set to 1333 for compatibility. The Intel memory spec is conservative, since memory is now sold with speeds up to 3000.

    Memory manufactures set the default SPD data to what they think will be safe values when their memory is used in different, unpredictable platforms. This is also done to accommodate users that don't know exactly what they have purchased. The goal is for the memory to work for any user. To run it at its potential speed, you must know what you are doing, by enabling XMP or setting the memory settings yourself. It's not an error or problem that your memory speed defaults to a lower value than expected, it works that way for all these reasons.

    Intel platforms require you to enable XMP in order to set memory to their highest specified speed. You can do it manually too. With the recent increase in memory speeds and its compatibility with SB and IB platforms (2133 - 2800+ settings available in the UEFI), we may see the default SPD data speed set at 1600 or above.

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