Have virgin media gig network hub 4 in modem mode 

tests show 1100mb into the router

deco says connection speed no more than 750mb

connected with cat 6

Should I be getting nearer 1000mb

what does a 10/100/1000 port sustain in speed, as I've heard I may need a 2.5gb port, which then leads to the question 

the new x60 and x90

x60 just says gigabyte port where the x90 says 2.5gb port

and what is the m5 port specs

as I am thinking of upgrading to either the x60 or x90, but as they are not cheap dont want to spend our then have to upgrade again

cheers

ian