Can I add another GPU card?

I have the AMD 760G Motherboard with FX-4300 for the brain and MSi Radeon RX 460 2GB GDDR5. My question is, can I add another GPU card that is exactly the same with the one that I mentioned to the motherboard? 2GB somewhat not enough for me because I play mostly games that need more "juice" for the graphics. Adding another 2GB maybe can help me. Thank you.