aren't all being made there ?If you want to run at stock on air, its not a problem at all and the cards are not defective.
However, some of the FTW3 PCB boards were manufactured in Taiwan and some were not, if you want to run on liquid cooling, you need to check the PCB manufacture location and do your own reading as to whether it is a problem for you.
Are you talking about the capacitors issue, which limit OC capabilities of GPUs