cyclone3d wrote on 2021-04-01, 08:49:
I kinda want to try that as well. I was messing with one of my boards months ago and accidentally set it to 50mhz fsb with one of my Cyrix 120mhz CPUs and it posted.. pretty sure it was at default voltage as well.
It's a couple of decades since it happened, but when I was trying to get the most of out my Cyrix, I tried it at 50Mhz bus speed, and what seemed to happen is that it ran, but automatically dropped to a 2.5x multiplier, so it was running at ~125, also the motherboard seemed to have kicked in wait states for 50mhz operation, so it actually seemed to be 3-5% slower than running at 3x40. In no other way could I seem to get this 2.5 multiplier to kick in though, other than trying to boot it at 50mhz bus, I don't know if it was the board doing it, or the CPU doing it. Now I did discover the undocumented 60Mhz, this is on an Amptron board that is a close cousin to the M919, and had it at 2x60, which benched higher. Funny thing is I got into multiple arguments about that over the years, people telling me it wasn't possible, but now I can point them to ppl who've done it on Vogons and shut them up 🤣. I found the 66Mhz setting also, but stability was extremely poor on that, could get a DOS prompt but nothing would run more than a few seconds. I was unable to determine whether it was CPU heat, chipset, graphics or I/O crapping out because all of them were on the raggedy edge really.
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.