That's because its limited by the graphics cards.. The graphics cards cant push the games and further at those resolutions and that's why you see everything so close.
Also you cant compare AMD v Intel clock speed to clock speed as the new AMD processors have a higher IPC so can do more with the speed they have. That's why you see the new chips doing so well even tho they have a much lower boost clock compared to the intel chips. Its more complicated than that of course but that's the basics of it.