Shouldn't be too terrible if K6-233 support is official. What problem I see there though, is no documented setting below 2.5V but a K6-2/3/+ BIOS upgrade being available, which may lead to regulator overload if running those CPUs faster than 350-400ish Mhz... because they still want the current.

Edit: and you can probably overload the 3.3V regulation by using a too hungry/late PCI graphics card.

According to official Asus website, the TX97 supports up to K6-2 333MHz. I have no idea if this is the fastest CPU that stays in safe limits of the motherboard or Asus stopped caring at certain point of time. So I guess sticking to period correct HW should be fine?

By the way I think there is an undocumented 2.2V jumper config.

If I recall correctly, the problem was the control chip for the voltage regulator circuit. Sorry, I don't have more specifics.

Some possible discussion of a voltage problem with dual-voltage CPUs here: ASUS TX97-X dualplane CPU's wont work ! and Re: ASUS TX97-XE (V3.x) and AMD K6-2/366AFR 366MHz

A lot of "us", the diehard socket 7 upgraders, were aware back in the day that pre-K6-2 built boards may not have voltage regulators that are happy with running CPU deep into the 300s and higher. So any of us who had any sense at that time, were starting CPUs up at low multipliers, keeping a finger on the regulator, seeing how warm it got, if only up to "drinkable coffee" warm, great, next notch up on multiplier and so on, until we got to "ouchy hot, hit the button!" and then considered the board only good to one speed notch down from there, with airflow on the voltage regulators helpful.

So it's probably related to problems while using fast K6 CPUs. Should be OK as I plan to use it with Pentium MMX 233 @260.

However I wonder if all boards are affected and if so, could be upgraded with some parts to make the power circuit more robust. Would be nice to know.

Ive got an Asus Sp97-v which is a cheaper sis based socket 7 board that also has the same power delivery comments made for it, came with a p233mmx that I guess has been there since it was new, Ive had it a 262mhz for 2 years without issues.

Interesting, SP97-V has the same power warning on the Retro Web page. So the conclusion could be it's fine if don't try to use a K6-III or similar on it and some high power draw PCI graphics card.

This chart, originally by C. Hare was the one I much referred to back around turn of the millennium for handy reference of CPU power requirements...
https://www.pchardwarelinks.com/elec_pentium.htm

Comparing that to voltage regulator and output transistor data sheets gave me the best go/no-go estimates for particular boards... still did the finger check though.

Great tip, thanks!

Use an external power supply for the cpu then 😀

Socket 5/7/SS7 (Voltage Interposer) Tweaker. (Released)