Agreed. You need a reputable test utility to test your max. Dual refers to channels 2.4/5 GHz so that the router can switch to 5GHz(Gaming) for less congestion. Also keep in mind that Windows uses network resources for update and keep in mind the other devices that may be on your network eating up resources. Also keep in mind ''300 mega bits (not bytes)'' in the internal network devices theoretical network max and will provide speed as needed based on protocols,hardware limitation,and alike. It is not going to pump 300mps on everything you do. Your ISP scales output based on usage. Talking to the outside world will be slower than internal network transfer speeds. If your only issue is DL/UL speeds,everything is working fine... then accept this or downgrade.