Range, Speed, Power?

[Congo]

Hello so I have a ASUS Z87-EXPERT motherboard with the wireless card built in, I have a Nighthawk router that is located in my family room. My Desktop is a floor up on the other side of the house (so there are like 4 walls my router needs to pass through to get to my room. I also have a NVidia Shield and I want to use it to stream games from my desktop to my living room but because of the range it lags, etc. So I was thinking of getting a TP-LINK Archer T8E AC1750 Dual Band Wireless PCI Express Adapter ( http://www.amazon.com/gp/product/B00RL4A314?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00 ). Will that help or is it just a waste of money?