In re-reading Anand's review of the KT133A, he stated that it was a KT133 except now the mobo's were "certified" to run the FSB at 133Mhz. So I'm assuming that Abit put a better quality resistor etc... to get to the KT133A.
A quote from the article:
Nonetheless, in late December 2000, shortly after the release of the 266MHz Athlon, VIA finally came back with the ?new? KT133A chipset, which is nothing more than the KT133 with official 133MHz support. Many have suspected that VIA intentionally disabled faster FSB speeds in the KT133 because there were no Athlons that supported such high speeds. This may even have been to appease AMD, although this is all just speculation. Regardless, the KT133A and its 133MHz FSB provided much of the performance of the AMD 760 chipset, but without the need for new and costly DDR-SDRAM. For overclockers, the KT133A promised to work with a much wider range of overclocked FSB speeds, sometimes as high as 160MHz or above.
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Soo, maybe a bios flash would work? Wonder if wpcrdet editing would work as well?