CPUs might be a different story, but I have the same experience as others: if I've gotten counterfeit goods I haven't been able to tell. At that point I don't really care.
On an individual level, sure. If the real product fails 1/1000 of the time, and the counterfeit fails 1/100 of the time, you've got 99%+ happy customers of both. The damage is only really evident in the aggregate.