@stephenw10:
Edit: Some Googling has shown that the Cyrix M2 333 actually ran at 250MHz! 333 was just a rating relative to a P100.
Yeah, I had the earlier P150+ that was rated to run at 120MHz. It was so unstable at that speed, however, that we ended up clocking them down to 90MHz. I ended up with 2 of them, back then. They were pretty worthless for much of anything desktop related, but once they were clocked down they were perfectly stable. They became a pair of DNS servers for our super-small colo we built back then.