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Thread: RAM:FSB Confusion!

  1. #1
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    Question RAM:FSB Confusion!

    Ok so.. The thing is..
    I have:

    asrock 4CORE 1600 TWINS P35.
    E8200 @ 1333mhz bus speed
    G-SKILL 800mhz DDR2


    And I think I messed up with the 800mhz ram, because they just dont seem fully compatible with the other parts. I'll explain why..

    On the ASRock board, there are actually JUMPERS to set the RAM:FSB ratio. And they look like this:






    Now as far as I can see, if i have to set the FSB to 1333 (which is what my cpu runs at) I'm forced to set the RAM to 1066mhz..

    But what confuses me is, when i read about clocking the E8200, they all mention setting the RAM:FSB ratio to 1:1, setting the CPU mhz to a good 490, thus leaving the RAM (DDR) at 980mhz.

    But how am i able to do so ?? I don't get it.. How can I set the FSB on the motherboard? I mean.. the FSB wont be 1333 mhz will it? I mean.. the CPU is running at 8x multiplier, @ 325mhz stock, making it 2.6ghz... how is that effected by tje jumper setting? Where is it running 1333mhz??

    I just dont get it.. And you cant manually enter the ratio in the BIOS. It HAS to be done by the means of jumpers.

    If anyone can help, it will be most appreciated. If not help, then at least explain it to me, because I fell like im missing something here.


    Thanks
    Last edited by 12mmChillFactor; 05-06-2008 at 14:44.

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  2. #2
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    Default

    Think you need to sort out the pictures link!?

    Sounds to me like the FRONT SIDE BUS TO NORTH BRIDGE RATIO option found in bioses which I think goes like this: (jump in and correct anyone?)

    you set the cpu Mhz lets say 400

    you choose a strap (if there is one) this will give you a choice of certain dividers such as 1:1 1:2 etc

    you choose a ratio to suit your ram

    on a maximus choosing the 333 strap gives me a choice of:

    1/1 giving a ram setting of 400*2*1/1= 800
    6/5 400*2*6/5= 960
    8/5 400*2*8/5=1280
    2/1 400*2*2/1=1600

    changing straps gives different ratios of:
    1/1 2/1 3/2 4/3 for the 400 strap
    1/1 2/1 for the 200 strap
    2/1 3/2 and 5/4 for the 266 strap

    So to summarise: Strap or no strap find out the ratios available and calculate as above

    selected cpu speed ,multiply by 2, multiply by divider of choice to get ram speed

    incidently the straps produce fsb speed you talked about ie 333*4=1333
    Rig2: 2*e5-26xx (16c/32t @2.4), Asus z9 pe-d8 ws, 32gb ripjawsz under water, rig3 2*e5-26xx (16c/32t @2.4), Supermicro 7047A-T 16GB 1600 ecc reg, on air, Rig4: 2*e5-26xx (16c/32t @3.1), Supermicro x9 DAi 16GB 1600 ecc reg, on air, Rig5: 2*e5-2660 (16c/32t @2.7), Supermicro x9 DRW iF 32GB 1600 ecc reg, on air

  3. The following user thanks grumpydaddy For this above post:

    12mmChillFactor (05-06-2008)

  4. #3
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    CPU: Core2 Duo E8200 ( @ 3.2 ghz )
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    Default

    Hahaha @ The pics.. I just couldnt be bothered to upload them (I will do that now though, just to straighten this post up)

    I figured it all out. The part that confused me was the fact that the FSB was 4xCPU mhz. I didn't realize that.

    I set the jumpers (yes, i have to set the RAM:FSB ratio with jumpers) to 1600mhz, thus making the ratio 1:1 . That allowed me to then set the CPU MHZ to 450, which with the 8x multiplier ended up at a good 3.6 ghz, and RAM at 900MHZ (they are 800mhz stock).

    So, after budging a bit with the jumpers, i actually managed to pull off exactly what i was trying to.
    I just couldnt believe that I had to mess with jumpers. But I did. Lol :$

    Thanks a lot for the answer Grumpydaddy, though I figured it out myself, your reply would have sorted it out for me as well.

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    You're welcome chap, Hope you got a good manual with that because the jumper labels aren't exactly intuitive are they.

    Let us know how you get on with this setup..... temps, speeds etc
    Last edited by grumpydaddy; 05-06-2008 at 14:57. Reason: spelling
    Rig2: 2*e5-26xx (16c/32t @2.4), Asus z9 pe-d8 ws, 32gb ripjawsz under water, rig3 2*e5-26xx (16c/32t @2.4), Supermicro 7047A-T 16GB 1600 ecc reg, on air, Rig4: 2*e5-26xx (16c/32t @3.1), Supermicro x9 DAi 16GB 1600 ecc reg, on air, Rig5: 2*e5-2660 (16c/32t @2.7), Supermicro x9 DRW iF 32GB 1600 ecc reg, on air

  6. #5
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    CPU: Core2 Duo E8200 ( @ 3.2 ghz )
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    GPU: Radeon HD 3870 512mb ( @ 850Mhz )
    • 12mmChillFactor's Full Spec's
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    No, the jumpers aren't intuitive that's for sure. I managed to figure it out though. Lol.

    Current clock:

    (it's the setup you can see in my profile.)

    Bus Speed: 333 -> 420 MHZ
    FSB: 1333 -> 1680 MHZ
    CPU: 2.66 -> 3360 MHZ
    RAM:800 -> 840 MHZ

    Idle Temp.: 38c - 40c
    Load Temp.: 57c (I used the torture tests in OTTC)

    Funny thing though, I didn't increase any voltage yet. But I think I might have to, since it's kinda rippling with 0.48%

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    Run prime95 first before you up the voltage. you should be aiming for at least 8hrs then if it passes you know there is no need for more volts unless you want to push for higher clocks
    Rig2: 2*e5-26xx (16c/32t @2.4), Asus z9 pe-d8 ws, 32gb ripjawsz under water, rig3 2*e5-26xx (16c/32t @2.4), Supermicro 7047A-T 16GB 1600 ecc reg, on air, Rig4: 2*e5-26xx (16c/32t @3.1), Supermicro x9 DAi 16GB 1600 ecc reg, on air, Rig5: 2*e5-2660 (16c/32t @2.7), Supermicro x9 DRW iF 32GB 1600 ecc reg, on air

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