looking for a budget gpu



what game can i play with i3 6100 intel hd 530 640mb 4 ddr4 2133mhz?in normal graphics and stable fps?
 


my psu is fortress included in the fortress case do i need to replace to it a better psu to put a dedicated gpu with 6 or 8 pin connector?
 


i play league of legends at 110 fps very high shadows low 1280x1024 640mb