DDRII 800 works at 400MHz...


I have bougth a new PC and in my Mobo (ASRock ALiveNF6G-VSTA) supports dual-channel DDRII 800 memory and when I start my PC it says at the startup screen that my memory runs on a single-channel mode and in the BIOS it tells me that it's running only at 400MHz and not the full 800MHz and I can't change it anywhere in the BIOS... How do I get it up to dual-channel mode?

Thank you in advance.
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More about ddrii works 400mhz
  1. DDR2 means double data rate, 400 Mhz IS 800. And you need two sticks for Dual Channel mode, are two sticks of ram installed?
  2. I'm sorry, 2 sticks means 2 memory "cards" rights? If so then, no I have a single memory stick.

  3. Yes two stick is two memory cards. In order to run run dual channel you will need two sticks of ram, and also make sure your motherboard and ram support it.
  4. Ditto -- DDR2 is 400MHz doubled to 800MHz. DDR 400 was 200MHz doubled to 400MHz.
  5. Your motherboard supports dual-channel, but you won't be able to take advantage of it without two sticks.

    As for your single stick, 400MHz is the correct frequency. DDR stands for double data rate, so the effective frequency is 800, but the actual raw frequency is 400.
  6. Alright, thanks for the info guys.
  7. LOL. It's normal.
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