1991. Am386DX-40 introduced at $200, quickly discounted to <$90 against Intels slower ~$200 386DX-33 and $258 486SX-20. With this one CPU AMD won the budget segment for a couple of years https://redhill.net.au/c/c-4.html#dx40 Intel replied by suing AMD, they lost the case.
2000. Duron/Athlon and first desktop 1GHz CPU. Intel replied by faking release of Pentium 3 1GHz, (only limited review samples, no stock shipped) followed by real release of 1.13GHz Pentium 3 dubbed the "Fastest x86 CPU in the world", except they crashed in users computers and resulted in expensive recall and delays https://www.tomshardware.com/reviews/revisiting-intel,221-2.... https://www.theregister.co.uk/2000/08/28/intel_recalls_1_13g...
2003. AMD64, first desktop 64bit cpu starting at $218, half the price of comparable Pentium 4. Intel replied by directly bribing, intimidating and blackmailing distributors/retailers, resulting in biggest EU antitrust fine at the time of over $1.3 Billion. Intel hasnt paid a dime of this fine to this date! and keeps throwing lawyers at the problem and appealing. https://www.telegraph.co.uk/technology/2017/09/06/victory-in...