TM came after multiple complaints lodged, with a new wifi router replacement, Dlink DIR842. However, when i was using the 5Ghz, the wifi speed i can get when i am near the wifi router only went up to around 450Mbps. (My package is 800Mbps). My laptop gets about 65Mbps on 5Ghz with using TPLINK AC600 dongle. should i upgrade my wifi adapter to newer version of adapter? if yes, TPlink T4U or TPlink T9UH? please advice