Since I actually updated my Cable Internet to the new standard, I've found a strange arrangement: via my living room router, a T-Mobile branded Asus AC 1900 (a popular model), my Xbox One X's internal speed test gets 208 mb/s (down) pretty easily (actual download speeds from Xbox Live are more like 130 mb/s, but the point stands). My LG smartphone next to the router gets 130 mb/s, which isn't too unusual. My Surface Pro will get Wifi speeds matching the Xbox, as you might expect.
However, my wired PC in the adjacent room, over a 25 foot Cat 7 cable
seldom goes over 102 mb/s.
Granted, 102 mb/s isn't that bad, but it seems like it should be a lot
better (in fact, if I use my separate BT/Wifi antenna hooked to my PC, I get comparable speeds through the wall of my apartment). For the life of me, I can't figure out what I'm doing wrong--wired network settings, both in Windows 10 and in the router itself, stump the hell out of me. The shielded Cat 7 cable is supposed to be cable of doing that over that distance....at least, that's why I bought it to replace a "much inferior" Cat 5 cable I had lying around.