So there are different WIFI routers available that vary is download/upload speed. He was referring to WIFI router that are capable or handling that speed. Since you have Cable through Cox, you can do a set up like this:
Internet modem:
http://www.amazon.com/gp/product/B00AJHDZSI?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00
WIFI Router:
http://www.amazon.com/gp/product/B006QB1RPY?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00
You waive the fee of the monthly rent of the modem Cox provides and you have a dedicated Router to maximize your WIFI needs.
This is the set up that I have with Comcast and downloading and playing games on PS4 while surfing the web has been smooth.
If you don't want to pay for the modem, connect the WIFI router to your current modem from COX, turn off the current WIFI network, and set up a new WIFI network through your new router.
Hope this makes sense, bro.