Firstly, change your PSU, that's a bad choice to go with. Get EVGA/ Antec/ XFX/ SeaSonic ones with atleast 550W wattage to be able to handle the build.
About performance: Not sure about next gen, it can run latest ones on FHD with 30-40 FPS on Ultra and 40+ FPS on high. It'll struggle on Ultra settings. High is okish but not the best to go. Medium would be 50-60 FPS. Reason: Not good-enough GPU, get R9 280 from GigaByte, lesser price, more performance. That'd add about 5-10 FPS to your performance. And next gen should be playable at medium-high settings too