What do you have in the room with your "internet connection"?
Router, switch, wall port?
Is wireless the only option acceptable with respect to your gaming PC?
Router --- Cat 5e Ethernet cable ---> Gaming PC is likely to be the fastest option.
Next would be Ethernet over Powerline Adapters. (Caveat: depends on your home electrical circuits.)
Wireless is likely to drag down internet speeds. No matter what you use.