I'm using a Celeron 333 overclocked to 415MHz, and my custom version of XP requires SSE...which the Celeron doesn't have. Kind of legit in this case unlike that BS with Kabylake.
Lol, still got my Pentium II 233 in working order despite heavy corrosion on the heatsink+rivets and the fan seizing up. Unfortunately my Pentium III cooler and after market Celeron cooler aren't compatible so its useless.