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    Noob FSB/RAM Question

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by SuperTuna, Aug 10, 2006.

  1. SuperTuna

    SuperTuna Notebook Enthusiast

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    Processor = DUO T2250 1.73GHz/533Mhz

    Ram = PC5300 (667Mhz)

    Since the FSB is 533Mhz, it will underclock the RAM to 533MHz, right?

    Thanks!
     
    SuperTuna, Aug 10, 2006
    #1
  2. miner

    miner Notebook Nobel Laureate

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    Yes.

    -----------------
     
    miner, Aug 10, 2006
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  3. SuperTuna

    SuperTuna Notebook Enthusiast

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    Nice and quick, thank you :)
     
    SuperTuna, Aug 10, 2006
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  4. gethin

    gethin Notebook Evangelist

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    Yes you are right, it will underclock to the slowest component.
     
    gethin, Aug 10, 2006
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  5. adinu

    adinu I pwn teh n00bs.

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    So what happens if the cpu fsb is the slowest component (aka 2300 yonah with a 533 ram). I dont think it clocks down the cpu fsb, and I dont think that it overclocks to 667 cuz then it would just be 667 ram.
     
    adinu, Aug 10, 2006
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  6. gethin

    gethin Notebook Evangelist

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    if your CPU is the slowest component then it underclocks the RAM to the same as the CPU. If its the other way around, then i'm not sure, i can't imagine that it will underclock the cpu to 533 - can any one answer this?
     
    gethin, Aug 10, 2006
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  7. pbdavey

    pbdavey Notebook Consultant

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    CPU @ 533 + RAM @ 667 = 533
    CPU @ 667 + RAM @ 533 = 533 (effectively, since the latency is on the memory bus, the FSB essentially is waiting on the memory bus)
    CPU @ 533 + RAM @ 667 + overclocking = somewhere between the two most likely
     
    pbdavey, Aug 10, 2006
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  8. gethin

    gethin Notebook Evangelist

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    I can't see how this is true, since i don't think it will slow the FSB down since the clock speed of the processor will suffer. Does it work on a system of multipliers. i.e. the CPU is multiplies 5x from the baseline 133mhz bus,and the RAM will be multiplied 4x. or is it:

    CPU @ 667 + RAM @ 533 = 667 With the cpu waiting on the RAM/memory controller
     
    gethin, Aug 10, 2006
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  9. pbdavey

    pbdavey Notebook Consultant

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    When both memory and CPU run @ 667 you get synchronous memory access, that is, the access from CPU to memory happens at the same time. If your CPU is 533 and memory is 667, the memory can read/write data faster than the cpu can request it, thus the memory is 533 (probably a hardware divisor that throttles the constant crystal frequency). If your CPU is 667 and memory is 533, you read data, but it takes longer to have the data available on the bus, thus is asynchronous access and you are effectively bottlenecked at 533. Now if you aren't accessing your memory (dealing in L1 and L2 cache) this doesn't affect overall system speed. Maybe this clears it up a little?
     
    pbdavey, Aug 10, 2006
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  10. gethin

    gethin Notebook Evangelist

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    Yes it does thank you :) Im guessing then that the FSB must work on a series of multipliers, otherwise the RAM woiuld be forced into running at 667, which would burn out the ram.
     
    gethin, Aug 10, 2006
    #10