Asrock z77 extreme 4 detecting my RAM in lesser speed

I have couple of confusions and troubles in my setup with the new system.

The second one here am putting is,

The board is detecting my corsair vengance DDR3 1600 mhz RAM as 1333 mhz.

Why is it ?

if i change it in OC tweaks of the bios menu, is it like OC or just adjusting to what it should be.


Help pls.
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More about asrock extreme detecting lesser speed
  1. Often you have to manually set your memory speeds and timings in BIOS. It should run fine after doing that. It will simply adjust the ram, no overclocking involved there.
  2. karthikparys said:
    I have couple of confusions and troubles in my setup with the new system.

    The second one here am putting is,

    The board is detecting my corsair vengance DDR3 1600 mhz RAM as 1333 mhz.

    Why is it ?


    if i change it in OC tweaks of the bios menu, is it like OC or just adjusting to what it should be.


    Help pls.

    Your motherboard's EFI BIOS is not set to use XMP Profiles by default.

    You can change the EFI BIOS setting to use the XMP Profile(s) instead of the default JEDEC SPD Timings Table entries. It will then be using the XMP-1600 timings instead of the JEDEC 1333 MHz timings.
  3. im using the same ram modules. you need to set your bios config to XMP for it to run in 1600 mhz...
  4. najirion said:
    im using the same ram modules. you need to set your bios config to XMP for it to run in 1600 mhz...


    i did the same thing set it to XMP with my z77 Ex4.
  5. what is the procie you're using? i3? or an i5?
  6. tech_twist said:
    i did the same thing set it to XMP with my z77 Ex4.


    I am using the i5 3450

    I too changed mine to XMp profile,
    Then its showing 800 mhz
  7. Here i s the link of my system's info.

    even after chioosing the XMP profile & speed to 1600 MHZ it runs @ 800 mhhz


    https://picasaweb.google.com/102210207361185797497/September92012#5785889634528380706
  8. karthikparys said:
    Here i s the link of my system's info.

    even after chioosing the XMP profile & speed to 1600 MHZ it runs @ 800 mhhz


    https://picasaweb.google.com/102210207361185797497/September92012#5785889634528380706

    DDR = Double Data Rate

    800 MHz external memory clock frequency x 2 = 1600 MHz

    Everything is working correctly.

    You were running at 666 MHz external memory clock frequency initially which resulted in the 666 x 2 = ~1333 MHz memory clock that you said that you were running at when the memory modules were first installed.
  9. ko888 said:
    DDR = Double Data Rate

    800 MHz external memory clock frequency x 2 = 1600 MHz

    Everything is working correctly.

    You were running at 666 MHz external memory clock frequency initially which resulted in the 666 x 2 = ~1333 MHz memory clock that you said that you were running at when the memory modules were first installed.



    Really, So it always show half of the speed in the display !!! Never heard of like this.
  10. Yeah that's what it is, the RAM's clock (I/O bus clock) is 800MHz but the effective clock relative to the FSB/BCLK is double (Data rate).

    If you know what a 'Sine Wave' is then the memory pulse (strobe) is on both the top & bottom, so data is transmitted twice per clock cycle.

    This idea isn't much different than a CPU Clock, but the multiplier is much higher.
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