What are speed changes are typically made?
Very common is 25 to 33 and 33 to 40. Apparently AMD 486- 40’s easily go to 50’s, because practically everyone is doing it. It seems that DX/2-50’s are not very likely to run reliably at 66 for some reason. It is also common for DX/2-66 to become 72 and 80 (lucky). There are some amazing cases, such as 486SX-25 running at 50 for two years, no problems. There are no intentions to add “real-life stories” of “overclocking” to this FAQ; such stories may be appropriate for another document.