Hello, I recently upgaded to Gigabit internet. My motherboard on my Computer is Gigabit ready, I just got a CAT7 cable(50ft). I thought my Gateway Modem was Gigabit ready since customer servivce said it was. Turns out the ethernet was only up to 850Mbps and Wifi not even being close. I only need Ethernet Gigabit speeds not Wifi gigabit speeds(if thats even possible). I don't know what to really do. Do I buy a Xfinity certified Gigabit ready Cable modem(off Amazon)? I still need Wifi for the house so could I still use my current Gateway Modem when I plug it into the cable modem? Or do I just get the Cable modem and Buy a Wifi Router?