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Question about a mobo's FSB multiplier.

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I'm really into computer hardware just like everyone else here im pretty shore. :) Ok Question is: Lets say you have a mobo rated at 800mhz FSB (Yea I know allot faster out there but trying keep this simple). Anyways even thou the mobo rated at 800mhz, the REAL FSB is 200mhz 4x (4x=multiplier). If the mobo is really has a 200mhz FSB then why is it rated at 800mhz? Dose multiplier mean there four times the data wires moving data (which would move four times the data but the data still moving from point A to point B at 200mhz or is the multiplier a like a amp for a FSB speeding it up by 4x? Im confused when it comes to this, I was hoping if one you guys that know your stuff can clear this up for me. Thanks for all the help and taking time to read this. :)

Edited by liljone, 11 May 2008 - 03:52 PM.

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Sometimes it rated as the number of bytes per second, as a 32 bit wide bus is 4 bytes you have a 4x multiplier. It can get very confusing.
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The FSB is dependent on the CPU, not the mobo. The mobo simply lists which FSBs it is compatible with. Intel has managed to pump out 4 instructions per clock cycle, called Quad Data Rate, giving the effective FSB a speed four times greater than the underlying FSB. The main reason it is advertised as 800mhz rather than 200mhz, is because doesn't 800mhz sound a lot better? :)
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