Video card power utilization

I have recently exchanged my old video card (nvida Quadro 2000 1gb) to a XFX Radeon RX580 8GB .
Unfortunately I do not see any performance gain when moving my camera position in a large model in Rhino 5.
Do I have to make some special setting to utilize the much bigger computing capacity?

Rhino 5 won’t benefit as much, but Rhino 6 will.