Have you rebooted and/or pressed the reset button on the router? Can the PC support the gig?
EDIT: Just read where you mention you allegedly are receiving what you're paying for. At AT&T they're going to tell you it's either the Ethernet cable or the PC. You could try with another router, though.
I think the PS4 can receive a gig. At least it should get over 350. Can consoles receive a gig? My PS4 is hooked up right next to my PC so I've been using that to test it also.
I've rebooted/pressed the button/unplugged it several times now.
I got a cat 7 cable (it was quite a bit cheaper than cat 6) but my speed dropped down to double digits. So I stopped using that cord. I may try it again.
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