Passmark is a synthetic benchmark, which is not always indicative of real-world performance; as I stated earlier, some of the information can be grossly erroneous.
Look for reviews on well-known sites like this one (Techspot), HardOCP, Guru of 3D, techpowerup!, Anandtech, bit-tech, HEXUS, LegitReviews and Tom's Hardware, among others, and check performance for yourself before deciding. Quite often, the games you'd want to play the most often can decide what card is better to buy for you.