He was good enough, what's your point though? That Pentium 3 (started well over a decade after Soviet demise) wouldn't have happened if he hadn't worked at Intel?
You gotta at least get your facts right. The Soviet Union collapsed in 1991. The Pentium III was released within that same decade (Feb. 1999) [1], not "well over a decade after Soviet demise".
In the same manner that the US space program would have advanced without input from Wernher von Braun [2], the development of Pentium III would have happened minus Pentkovski, though their presence pushed development faster and in directions that the projects would have taken longer to reach without them.
Pentkovski is no von Braun, just one of scores of processors engineers in his cohort. That there was pentium 2 before him and 4 after him is a pretty solid hint.
In the same manner that the US space program would have advanced without input from Wernher von Braun [2], the development of Pentium III would have happened minus Pentkovski, though their presence pushed development faster and in directions that the projects would have taken longer to reach without them.
[1] https://en.m.wikipedia.org/wiki/Pentium_III [2] https://en.m.wikipedia.org/wiki/Wernher_von_Braun