ASUS P2B rev 1.12. settings for FSB 103mhz and 105mhz? \ VOGONS

ASUS P2B rev 1.12. settings for FSB 103mhz and 105mhz?

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First post, by egbertjan

Posted on 2025-10-22, 21:01

egbertjan Offline

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I have an ASUS P2B rev 1.12. I see in the manual for rev 1.10 (I can't find the one for 1.12, unfortunately) that it should be able to handle an FSB of 103MHz and 105MHz via jumpers. If I set the jumpers for 103MHz, I get 133MHz and PCI 44.33MHz. The jumper settings for 105MHz are the same as those for 140MHz and 35MHz PCI. The jumper settings for 110MHz, 112MHz, 115MHz, and 120MHz are correct. Does anyone know how to set the jumpers for 103MHz and 105MHz?

Here's the picture of how it's described in the manual.

The attachment Schermafbeelding 2025-10-22 224102.png is no longer available

Reply 1 of 4, by smtkr

Posted on 2025-10-23, 00:30

smtkr Offline

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Can you test these configurations for the FSB. There appears to be errata on your linked sheet.

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Reply 2 of 4, by shevalier

Posted on 2025-10-23, 06:54

shevalier Offline

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https://www.alldatasheet.com/datasheet-pdf/do … ICS9248-39.html

Next, check for yourself what exactly Asus copied incorrectly from the datasheet of clock IC.

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Reply 3 of 4, by PARKE

Posted on 2025-10-23, 08:04

PARKE Offline

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shevalier wrote on 2025-10-23, 06:54:

Next, check for yourself what exactly Asus copied incorrectly from the datasheet of clock IC.

The 105 setting is ok but the 103 setting is wrong.
This is from another ASUS motherboard manual:

The attachment 110.jpg is no longer available

Reply 4 of 4, by shevalier

Posted on 2025-10-23, 08:25

shevalier Offline

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It doesn't matter.
Frequencies are determined solely by the configuration pin values of your specific IC clock (ICS9248-39)
A different motherboard may have a completely different clock IC, even from a different manufacturer, such as Winbond instead of ICS, or even Realtek.
With a completely different table.

If that doesn't help, check what clock chip is installed on your specific board revision and look up its datasheet.
The specified table will be on page 3 at most.
If some combination does not work, although according to the data sheet it should, then it could be anything, starting from the oxidation of the jumper.

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