Nah the 4500 is toast....I have everything hard wired...cant stand wireless..only use it for my cell phones and tablets so I use a dlinkap Dap-1320 extender.
One question?

set up QoS everything works
however xboxone has its own speedtest
with Qos on I've set the bandwidth setting from one that equals my IP's 35/3 conecction and increasing each time the xboxone with Qos on was reporting 17/2...18/2....20/2.5 with each time I changed my connection speed on router. the last being the maximum setting on the router...hope I explained myself???
I turned Qos off and xboxone reports bandwidth equal to or greater than my Isp's connection usually 38/3.5
I have rogers cable (Canada) 35/3 connection router connected to their internet Cisco DPC3825 DOCSIS 3.0 Gateway
In bridge mode. My Isp also uses speedboost (if there is available badwdth on Isp I get above and beyond my advertised speeds, download side....it fluctuates from 36/3 to 75+/3 )
all in all....when I game only one Pc is usually on allways in idle....and my cell phones connected wirelessly
Do I really need to have Qos on..will it make a difference?