HUB 4, GIG1 not full speed unless plugged direct from modem

[hotfuzzybody]

Installed the HUB4 today with gig1.

Speeds direct from the modem on my PC are as advertised 900Mbps+

When I detatch the rj45 from the modem and plug the same rj45 it into my Asus Nighthawk X6 R8000 Router,.which has 4x gigabit ports, i get around 350Mbps.

Can anyone explain why this huge drop in speed?
I'm thinking it could be one of the rj45 cables are not 1gig spec, not cat6 or higher.
The cable from the modem to the asus router is cat5e on inspection.
The cable from the asus router to my pc is cat6.
Would a cat5e cable give 350+ speeds and not the full 1gig?

[Swiftly]

See old tread but, same VM 1gb speed same nighthawk router, had same speeds etc 350 in modem mode

Full reset and update of the router sorted the problem now 950 from nighthawk R8000, Let the router sort connection then re set up same wifi name and password  works fine

[hotfuzzybody]

What is your firmware version on the Nighthawk R8000?