The dual core i5 has revised design based on the i5-750 and the more efficient 32nm architecture.
Hence, it knocks down i5 in apps/games that do not take the advantage of the 3rd and 4th core.
However, more and more apps/games are designed to fully utilize quad core CPUs and therefore you will expect 750 to take down the dual core i5 in most cases in the near future.
In addition, the minimum fps does not worry me at all, because what I really care is the average fps.
By the way, i5-750 leads in more CPU demanding game titles according to the article you linked.