Why is my PC6400 RAM at 400MHz?

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  • Newbie2
    Badcaps Veteran
    • Sep 2005
    • 885
    • Canada
    #1

    Why is my PC6400 RAM at 400MHz?

    Hello guys,

    I got a small question. Why is my PC6400 RAM only operating at 400MHz? I looked in CPU-Z for my RAM's frequency, and I saw it reports 400MHz instead of the 800MHz I was expecting.



    Another forum has told me to set my ratio to 1:1. Will that overclock my RAM based on the FSB frequency of my E2180 processor?

    Can anyone please give me a good answer why my RAM is only operating at 400MHz?
    My gaming PC:
    AMD Phenom II X6 1100T Black Edition 3.3GHz Six-Core CPU (Socket AM3)
    ASUS M4A77TD AMD 770 AM3 Motherboard
    PowerColor AMD Radeon RX 480 8GB GDDR5 PCI-Express x16 3.0 Graphics Card
    G.SKILL Value Series 16GB DDR3-1333 RAM (4x4GB dual channel)
    TOSHIBA DT01ACA200 2TB 3.5" SATA HDD (x2)
    WD Caviar Green WD20EARX 2TB 3.5" SATA HDD
    ASUS Xonar DG 5.1 Channel PCI sound card
    Antec HCG-750M 750W ATX12V v2.32 80 PLUS BRONZE Power Supply
    Antec Three Hundred Mid-Tower Case
    Microsoft Windows 10 Pro 64-bit
    Microsoft Windows 7 Ultimate SP1 64-bit
    Tags: None
    • Leopard
      Senior Member
      • Mar 2008
      • 109
      • Finland
      #2
      Re: Why is my PC6400 RAM at 400MHz?

      This is simple.
      DDR stands for Double Data Rate. 400MHz times two equals 800MHz. So don't worry, they operate @ 800MHz really.

      Edit: This should explain it a bit.
      Last edited by Leopard; 07-02-2008, 08:38 AM.

        Comment

        • acstech
          GrumpyModerator
          • Jul 2007
          • 1432
          • USA
          #3
          Re: Why is my PC6400 RAM at 400MHz?

          On the ram: Leopard is right on.

          On a side note:
          That processor is already overclocked! Anyway, you will get better performance with the fsb:ram at 1:1. As already mentioned, CPU-Z reads the actual number of megahertz (MHz) that the ram is running at. Since it is DDR, it has an effective speed of 800 MHz. A similar thing goes on with the FSB. Notice how your FSB is 266? Intel FSB's are QDR, or Quad Data Rate. So the effective FSB is 1066 (or 1064... close enough).

          Anyway, they run best at 1:1, where the actual FSB frequency equals the memory frequency. This means set the FSB to 400 MHz (for 1600 effective), and lower the CPU multiplier to 7 or 8, depending on how fast your processor will go. Note that not all Allendale's (2xxx and 4xxx series Core 2 derived processors with 800MHz effective FSB) will do a 400MHz FSB. It's all down to luck which ones do and which ones don't.

          I've got a friend who I built a computer for that I set up like that. 400MHz FSB, 8x multiplier, E2180 processor, and 3.2GHz processor speed. It took a slight bump to the voltage to do that, but it's quite stable. He did run into the P35 chipset double boot thing, but that's not a big problem.
          A man convinced against his will is of the same opinion still.

            Comment

            • stevo1210
              Badcaps Legend
              • Oct 2006
              • 4156
              • Australia
              #4
              Re: Why is my PC6400 RAM at 400MHz?

              I was wondering about the same thing the other day... looks like I got my answer to why my RAM is running at only 400MHz....

              Thanks.
              Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous

                Comment

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