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Question Re: CPU speeds vs FSB speeds?

Discussion in 'A+' started by Slaughta98, Jun 11, 2009.

  1. Slaughta98

    Slaughta98 New Member

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    Hi all,

    I have just started self studying my way through the Mike Meyers a+ book.

    I just wanted to double check my understanding of the relationship between CPU internal and external speeds in relation to the Frontside bus?

    Am I right in understanding that if a CPU has an internal speed of 1Ghz (e.g. 100Mhz x 10.0) that the motherboard would need to have a FSB speed of at least 100Mhz?

    I am stuggling to get my head around how to match up the speeds for the different CPU internal and external speeds vs FSB (external data bus & address bus combined) ??

    I hope that makes sense... I got confused just writing it down?

    Thanks
     
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  2. Qs

    Qs Semi-Honorary Member Gold Member

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    Read and absorb - http://en.wikipedia.org/wiki/Front_side_bus :)

    Qs
     
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  3. Slaughta98

    Slaughta98 New Member

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    Thanks for that link Qs!!

    That made a lot of sense... Perhaps Meyers just went on about it too much...

    Thanks again, sorry for being lazy. I'm embarrssed that I didn't check out Wiki
     
    WIP: CompTia A+ & N+
  4. greenbrucelee
    Highly Decorated Member Award

    greenbrucelee Zettabyte Poster

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    my FSB is 433 x 9 or 3897MHz or 3.91GHz which hopefully will help you work out the speeds and how to figure it out.
     
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  5. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    My FSB is 36C
    Hope that relaxes you abit
     
  6. greenbrucelee
    Highly Decorated Member Award

    greenbrucelee Zettabyte Poster

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    you beat me by 1 degree :D
     
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  7. Slaughta98

    Slaughta98 New Member

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    See now I am even more confused lol

    I have an Intel E4600 CPU at home so am using the information on that (CPU-Z) to help me try to work out what is going on here? The technical spec says that the CPU has a bus speed of 800Mhz, Cache speed of 2.4Mhz.

    The CPU's external speed as i understand it is 200Mhz (x12 mulitplier) 2.4GHz Internal speed?

    What is the bus speed?? (800Mhz)? I think thats why i am getting confused? Multipliers allow CPU's to run much more quickly than the motherboard, don't they? So does that mean my processor is actually capable of running at 800Mhz x 12? Surely not? Thats 9.6Ghz! Not possible on an E4600??

    I have read the article mentioned on Wiki but I still cannot 110% get my head round this?
     
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  8. greenbrucelee
    Highly Decorated Member Award

    greenbrucelee Zettabyte Poster

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    your core speed is what you cpu is running at.

    the multiplier is what it is multiplied by

    The Bus speed is the mobo speed

    Rated FSB is what the cpu FSB is

    Here is a pic of mine
     

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  9. Slaughta98

    Slaughta98 New Member

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    Got it! Your a star thanks greenbrucelee!!! seriously... thanks!
     
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  10. soundian

    soundian Gigabyte Poster

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    You need a master clock to synchronise all the activities of your computer. The 200MHz external (to the CPU) speed refers to this; it's your mobo speed. Everything else works using this clock as a baseline (2.4 GHz=12X, 800MHz Bus speed=4 times, or quad-pumped Front Side Bus).
    You'd need DDR2 RAM to work with your quad-pumped FSB, cos they're both 4 times faster than the mobo clock.
    That's the way I understand it anyway. The important thing is: there's a master clock by which all speeds are triggered. Your CPU and bus speed are multiples of this because they use the mobo speed to trigger their own clocks.
     
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