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Bus speed question

B

bbarnes

Senior member
Alright, someone told me this before but I was stupid and didn't write it down or remember it...

How do you find the AGP and PCI bus speeds? They told me you had to multiply it by different things if you had a 100 or 133 fsb speed and it was like 1/5 for the PCI and 1/3 for the AGP, something like that, but I just cant remember.

TIA
 
Not quite sure about AGP. PCI should be running at 33Mhz in a non-overclocked system. So if you have a 100Mhz FSB, your PCI divider is 1/3, and if you are at 133Mhz, your divider is 1/4. Some mobos support additional dividers, like 1/5. This would allow you to overclock the FSB to 150Mhz and still keep your PCI at 33Mhz.
 
I believe AGP runs at 66MHz on a non-overclocked system, so the divider would be 2/3rds. (that's if I remember correctly, which is a very big IF).
 
Confirmed from my old post:

Jman13:

<< If your processor has a default FSB of 100MHz, divide the FSB by 3 to get the PCI speed, multiply by 2/3 for AGP. If you are at 133 default, multiply by 1/4 for PCI, and by 1/2 for AGP >>

 
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