FSB ratio

Discussion in 'Die-hard Overclocking & Case Modifications' started by brz555, Jun 26, 2006.

  1. brz555

    brz555 Master Guru

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    GPU:
    GTX970 WF3x OC
    What actually happens when you've got other than 1 : 1 FSB ratio? As I understand it, that would produce some empty clocks in the system and reduce the overall preformance. So, is it better to put the FSB 1 : 1 at highest possible speed, or to force max FSB speed but with a multiplier as my memmory just can't take any higher? I've tried with 5 : 4 and the moment Windows logged on I got and error msg!
     
  2. Freddoww

    Freddoww Member Guru

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    GPU:
    x800 pro 535 / 1160 + fat1lity
    I was trying to figure that 1 out too.

    with 1:1 i could only hit 3.3 ghz stable (crappy memory) and with 5:4 i can hit 3.6 ghz.

    With the 3.6 ghz i noticed a performance boost in games so go for the 5:4.

    I also want to know excactly what the difference is....so any1? :D
     
  3. Clements

    Clements Master Guru

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    GPU:
    Geforce GTX 670
    The faster your memory is running, the more memory bandwidth you have. For example:

    CPU Multi x HTT = Clockspeed
    9 x 250 = 2250MHz
    10 x 225 = 2250MHz
    ---------
    9 x 250 is faster (if both are not running some kind of divider).

    It is not easy to explain quickly, so I will use an example:

    If you have found through experimentation that your memory can run up to 220MHz stable, and your CPU Multiplier is 10, then you can use a divider to pass 2200MHz with your memory still maxed out. By using the 166MHz divider, you can now reach up to 2640MHz with your memory still maxed out at 220MHz.

    The best overclockers will make good use of higher memory clocks as well as high clock frequencies to increase performance.

    Edit: My examples are for AMD CPUs, but the general principle is the same for Intel.
     
    Last edited: Jun 28, 2006
  4. KJMach

    KJMach Master Guru

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    GPU:
    Sapphire X800GTO Fireblade 550/550
    1:1 on my sytsem is better then my 4:3. I can only run 4:3 under 4ghz. Over 4ghz my cheap memory is to slow and i must switch to 1:1.
     

  5. Freddoww

    Freddoww Member Guru

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    wth..thats a nice overclock u got there. And only 1.45v?! how did you manage to do that :p
     
  6. deathvirus

    deathvirus Ancient Guru

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    GPU:
    RTX 2070 MaxQ 8GB
    Huh ?? At 4 GHz ur CPU should be way better .. not depending upon the divider ratio ....
     

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