I don't think they've revealed *THE* problem with their 10nm process, but it seems to essentially be that they are having so many defects on it that they can't make reasonably large chips or chips ...

Set in the heart of Silicon Valley, the Computer History Museum long cheered the developments around it. Now, it’s taking a more nuanced approach. Credit...By Loren Elliott For The New York Times ...

Interestingly, both K6 and K7 were originally not AMD's designs. They were created by a small fabless company called NexGen, which got acquired and subsumed into AMD ...