Well.....that is pretty hot. Especially if it was one of the original Pentium 60's, those were notorious for that sort of thing.
But, you could've just taken the top off, and put a fan on it. Mission accomplished.
IIRC 233mhz Pentium MMX.
Someone gave me one of those years ago, and I didn't know what it was, just that it was a really exotic looking Pentium something or other. Recently I re-discovered the relic and went on line to look up the part numbers on it. I found out it was a first generation Pentium 60, with a massive heat sink stuck on it, and a history of overheating due to running on 5 volts instead of the later 3.3 volts and lower.
So, my exotic looking mystery device turned out to be a museum piece and a little toaster over.