I’ve been working though my boxes of old hardware and just got up to the 430tx era. These boards made good homes for my cyrix cpu’s. The k6 chips that I have are all low voltage, and I hate to put a 2.0v chip in a board that only goes down to 2.6v. The intel chips that I have went to OEM boards that didn’t support flexible voltages or bus speeds. By process of elimination, cyrix was the choice.
Even though the boards only go to an 83mhz bus, I was able to run the MII 366 at 83x3 almost as nicely as the 100x2.5 that the spec sheet lists, and at that speed I was able to get a stable build using surplus EDO ram. So that combo worked out well for me. The other TX board got a 6x86mx at 75x2, but Im sure it would have done well at 66x2.5. Also a stable build, also used up old EDO ram. The boards don’t support AGP, but these chips were never going to play Halflife anyway.
I have some via super 7 boards , but those seem like better fits for the K6 cpu’s since they will do the voltage and bus speeds that those chips want. if I can ever get them to boot. Which hasn’t happened yet.
Your available hardware is probably different, but maybe you will have good luck with the cyrix chips like I did. Just don’t expect to get great over clocks out of them.