Afaik AMD improved licensed Intel 286/386 designs as part of second source foundry agreement for IBM and their first attempt at their own architecture the K5 wa

Afaik AMD improved licensed Intel 286/386 designs as part of second source foundry agreement for IBM and their first attempt at their own architecture the K5 was really not that good. They then bought a new chip startup called NexGen which became the K6/K7 later the Athlon.