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Thread: System Memory Multiplier Question




  1. #1
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    Default System Memory Multiplier Question

    I have a GA-EP45-UD3P MOBO and an E8500 processor overclocked to 4 GHz. Right now my System Memory Multiplier is at 2.66D and my 1066 memory is at 1125. All is fine, there are no problems. But if I raise my CPU Host Frequency and don't lower the multiplier my memory won't like it. In the BIOS I could choose a 2.40A . But what happens with the A vs D?

  2. #2
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    Default Re: System Memory Multiplier Question

    I would say that is probably right. A= 266 MHz B=333 MHz C = 200 MHz D = 400MHz. Also for an easy way to tell just multiply the FSB x the momoty multiplier.

    Example: 423 MHz * 2.40 = 1020 Mhz

    I don't know what choices yo have to choose from but if you have a 2.40B that is what I would try.
    Last edited by Conners; 10-20-2009 at 02:03 AM.

  3. #3
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    Default Re: System Memory Multiplier Question

    Here is the situation. My Clock is 9.5 ,my CPU Host Freq.422 =4009 MHz. System Mem. Multiplier 2.66D x 422 = 1122MHz Memory. So if I increase my Host Frequency to 450 I would have to reduce the multiplier to the 2.40A so the memory MHz don't go too high. But what about the A.

  4. #4
    Chike is offline Senior Member
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    Default Re: System Memory Multiplier Question

    There is no 2.40A multiplier. There are 2.50A or 2.40B. A strap multipliers are unlikely to work at FSB400+ but you can try them. Whatever works for you and give the best performance.

  5. #5
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    Default Re: System Memory Multiplier Question

    You are correct. I should have said B instead of A. Of course I don't need 4.275 MHz but if I go to 450 Host frequency I would have to lower the Mem. Multiplier. Would the 2.40B cause me problems? Would it be worthwhile?

  6. #6
    Chike is offline Senior Member
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    Default Re: System Memory Multiplier Question

    You will probably see increase of memory performance, if it does work for you, but this also depend on tRD(Static tRead Value) settings.

  7. #7
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    Default Re: System Memory Multiplier Question

    If I do up my CPU Host to 450 and set the System Memory Multiplier to 2.40B my CPU will be at 4.275 and my memory will be at 1080. Right now at 4.009 I have no problems and running OCCT the max. CPU temp was 45c. By the way the Static tRead settings are on AUTO.

  8. #8
    Chike is offline Senior Member
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    Default Re: System Memory Multiplier Question

    Auto won't give good performance. Ignore it though until you done OCing the CPU.

  9. #9
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    Default Re: System Memory Multiplier Question

    Well Chike I tried the settings but it didn't like it. It shut down, so I set it back the way it was. 4GHZ is fast enough.

  10. #10
    Chike is offline Senior Member
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    Default Re: System Memory Multiplier Question

    You can't expect that by just changing multiplier and increasing FSB you'll get it to work.
    Try with lower CPU ratio, 9 or 8.5 first to see the multiplier does work, then make necessary changing for higher CPU speed.

    Not having your full current BIOS settings, there not much more that can be said.

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