Asrock mobo settings for OCZ DDR2 PC2-6400 RAM

By bluezz
Sep 8, 2007
  1. Hey there,

    I recently bought OCZ DDR2 PC2-6400 Platinum Revision 2 RAM:

    I have Asrock 775Dual-VSTA mobo and here is the website:

    My question is that even though I understand that my mobo supports DDRII667/533, what are the best setting for the RAM to run on my system ?

    These are a couple of CPUZ screenshots for the DEFAULT settings my mobo detected for the RAM.

    Thanks in advance :)
  2. bluezz

    bluezz TS Rookie Topic Starter

    Please correct me if I am wrong but is it not ok to run a high-end RAM on slower frequency for relatively old computers ? :suspiciou
    For example, PC3200 memory should work fine in a system that takes PC2100 or PC2700.
  3. sghiznaneck

    sghiznaneck TS Maniac Posts: 403

    Not true. He can run the 800 mhz RAM on the system; it just won't perform at that speed and frequency. He won't be able to optimize the benefits of the faster RAM, but it will work.
  4. bluezz

    bluezz TS Rookie Topic Starter

    So is it okay to crank up my frequency to 677 then yes ?
  5. pdyckman@comcas

    pdyckman@comcas TS Rookie Posts: 527

    Use the 800 mhz and leave everything alone. It clocks down.
  6. sghiznaneck

    sghiznaneck TS Maniac Posts: 403

    Yes and No. It all depends on the RAM. Some RAM will take it and so will some computers. Yoiu can try it, but if the computer won't take it, you'll have to clear the CMOS settings (jumper on the mobo). Additionally, if it's cheap RAM,you stand a chance of frying it, but with OCZ, it shouldn't be a problem. If the system becomes unstable (based upon the mobo), you may have to reboot and go into safe mode to reset the bios.
  7. bluezz

    bluezz TS Rookie Topic Starter

    my bios does not have an option for 800mhz :(
    should I be using tools like memset to force 800 ??

    I've changed timings to 4-4-4-15 with DDR2-667

    but now I am not sure about the fsb/ram ratio.. is 3:5 ok or can I make it 1:1 ?? does it even matter ??

    also, is 3:4 better (which I get with DDR2-533) or 3:5 better (DDR2-667) ??
  8. sghiznaneck

    sghiznaneck TS Maniac Posts: 403

    Agree with Codex Computing. Let the bios set the RAM speed and timing. If 667 is the fastest RAM the mobo will take, it will clock down (automatically) to 667. You won't be utilizing the RAM to its fullest potential, but it's better than frying your hardware. Just leave it alone.
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