First post, by kool kitty89
I put together a Celeron 366 retro rig for a friend a couple months back using a socket 370 Soyo 61ZA-NA (440ZX chipset) motherboard my family had in storage.
At the time of the build, I only bothered to test the BIOS selected 75 and 83 MHz FSP overclocking options as I didn't want to push the system too hard and the board itself had been set to the default 66 MHz jumper (so I assumed my dad hadn't pushed a 100 MHz overclock back when the board was in use some 10+ years ago). I'd gotten the impression that 366=>550 MHz Celeron overclocks were a bit iffy in general, especially without a bigger heatsink and voltage boost to ~2.2V.
However, yesterday I was over at that friend's house and decided to give the 100 MHz jumper a try. To my surprise, with only the stock intel branded heatsink+fan and the board's default 2.08V, it ran just fine in DOS and Win98SE with all the games he had installed (a bunch of Diablo II was the newest thing iirc). Less surprising (especially given the modest voltage and good case cooling) was the CPU temperature remaining quite reasonable as well, peaking just over ~40C/105F. (well within spec for that CPU)
I'd also already been using PC-100 RAM, so that wasn't an issue.
I didn't run any benchmarks yet though, and he didn't have Unreal installed, so I couldn't test the stability there either (I know Unreal tends to be finicky about CPU stability), but otherwise there were no noticeable bugs at all . . . at least beyond some problems that were already present before the overclock.