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?
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