History

This link will give you all the processors from quite some time ago to relatively new.

http://www.tomshardware.com/2004/1 [...] ts_part_1/

To highlight and steal information: Socket 4, presented in 1993, was finally developed for two processors: the Intel Pentium 60 and the Pentium 66 - so the first pentium was well before Windows 95 debut.

AMD at that time were developing 486 DX level chips that were commonly interchanged with Intel DX chips. Some at a DX-2 rating (60, 66 mhz), some at DX-4 (100, 120, 133)

AMD moved to the K5 line in 1993 starting at 75mhz and going to 166, then debuted the K6 line after that which had multiple renditions, the K6, K6-2, K6-3........

Check out that link, it has all of the history on when these processors were introduced and by which company.