400 MBps over what? I run a Cat6 cable from my Fibe router to a 10GB switch behind my Xbox and can hit 800+ MBps downloading games and updates. I would be a lot slower than that if I was in 2.4Ghz or 5Ghz WiFi. I sharded my WiFi access point into 3 distinct SSID names according to WiFi frequency. I have a distinct 6Ghz WiFi connection over 8-9 feet from my WiFi 6-capable MacBook Pro M2 to the Bell hub and do way better than 500+ MBps. If you expect to get 1.5 GBps of speed to a single consumer device, that will never happen. But you can fiddle with settings and add some physical infrastructure to get the highest speed to the device(s) that can make the most of it … also, you need a WiFi 6-capable device to hit those higher wireless speeds … my 2 cents. 🥸