Grphics Card

Everytime i play fivem my pc turn off Why?? i5 9400f,16gb ram 2666mhz(oc),rx 470 4gb strix

There must other topics about this question. I want to spend about 500euros for a graphics card, but i can't decide which one. For example, there is rtx 2060 8gb super gaming OC 1.65 ghz, memory speed 14000mhz memory bus 256bit, and inno3d rtx2070 8gb super jet x1, 1.77ghz, 14000 mhz memory...