PCI deviders on a BX-chipset

[Hawkeye_(BEL)]

Hi,

If I remember correctly, the BX-chipset has three deviders to keep the PCI bus in spec on three different FSB'es. On 133Mhz, it is 1/4, 1/3 and 1/2 for 100 and 66Mhz FSB respectivly.

Then why do I see in the BIOS of a friends MSI BXMASTER the following : 122/37 ? That's a 122FSB with a PCI frequency of 37Mhz. So, to get 122 from 37, you have to multiply by 3.3. I've looked in my BIOS, and this isn't an option there.

Now, I thought the deviders are limited by the chipset, and that they are NOT a BIOS issue (otherwise, everybody would be running his BX mobo on 133Mhz with a new AGP devider of 1/2).

Has anyone else seen this before ?

 

[AndyHui]

PCI dividers are implemented somewhere on the motherboard, and are not specifically controlled by the chipset.

ASUS has always had a PCI 1/4 divider since the very first P2B....other manufacturers like Abit did not have this until later.

AGP divider, unfortunately, IS controlled by the chipset, and cannot be changed by the motherboard manufacturer.