Z tego co znalazłem to VIA KX133 nie wspiera oficjalnie Thunderbirda.

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Problemy konstrukcyjne płyt dotyczące sygnał�w.

The only possible explanation for the ability of the Thunderbird to be guaranteed to work with the AMD 750 chipset but not with the KX133 is because the KX133 reference design features timing specs that are out of the Thunderbird's range.  This could also explain why certain motherboard manufacturers are claiming that their KX133 settings work fine with the Slot-A Thunderbirds; basically, if a KX133 motherboard manufacturer is claiming their board will work fine with a Slot-A Thunderbird, they're probably just increasing the tolerance the board has for out of spec signals or boosting the signal strength going to the processor itself.