They also started to slip behind AMD in the Pentium 4/NetBurst era, but got their footing back with Core (a more direct descendant of the P6 than the Pentium 4!)
Around the same time, but I’d classify as separate stumbles.
During P4 Intel kept their footing with bribes. Article touches on this
"Some companies, notably Dell, remained Intel-only well into the 21st century,"
Dell was receiving $1Billion a year in bribes from Intel https://247wallst.com/consumer-electronics/2007/02/02/michea...
"The documents filed in District Court claim that there were $1 billion in kickbacks and payments."
That was the only way to make big boys plunge into Pentium 4 with Rambus fiasco.
During P4 Intel kept their footing with bribes. Article touches on this
"Some companies, notably Dell, remained Intel-only well into the 21st century,"
Dell was receiving $1Billion a year in bribes from Intel https://247wallst.com/consumer-electronics/2007/02/02/michea...
"The documents filed in District Court claim that there were $1 billion in kickbacks and payments."
That was the only way to make big boys plunge into Pentium 4 with Rambus fiasco.