http://www.techradar.com/news/some-ryzen-5-1600x-buyers-have-found-their-6-core-cpu-has-8-cores

Some folks who've bought Ryzen 5 1600 or 1600X processors have found that their chips have two more cores than expected, which can only be described as a massive win on the CPU lottery.

These CPUs should have six cores and 12 threads, but reports on Korean forums (spotted by Wccftech) say some users have found they have eight cores (and 16 threads) out of the box.