I really need help PC HARDWARE!?

As for a gaming configuration what everyone needs is a good graphic card and the graphic card that you have will def. serve you play games at high settings. But it is also necessary that one should have a good huge cabinet with atleast 550 Watts of power supply for its air flow or cooling and support respectively. Your graphic card will need a power connector from the psu so confirm it rather going for the psu and cabinet that you have listed. Other peripherals are good enough