1. What modem is it connected to?
2. What firmware is on it?
3. Try enabling IPv6
4. something to try? If you just bought it, it probably just got a bunch of updates. Try a factory reset and run it with basically stock settings. Don't enable qos, traffic monitoring, parental controls, armor. See what speeds you get straight from the factory.
It should run gigabit.
5. Also check the website you're testing with. not all can saturate gigabit. Try speedtest.xfinity.com or dslreports.com
6. What device are you testing on? Make sure you're testing over wired connections and not wireless.
Are you running link aggregation?
if so, disableit. Its been problematic for all manufacturers with consumer devices. Sadly
After you changed firmwares, did you factory reset?
Try reset the router and do a fresh setup.
This is my setup:
Enable OFDMA both 2.4ghz and 5ghz
5G channel 44
HT80 or HT160
QoS: Enable WMM both both 2.4ghz and 5ghz
Dont't plug anything to USB
try it to see if it works.
authburg, I have the same pair of devices.
Are you referring to the wires between the router and the modem?
Did you say you were using link agregation?
I know this sounds stupid, but sometimes I have to enable QoS, reboot, disable QoS, reboot to get speeds where they should be.
(Also try the other way around if you prefer QoS on.)
I have no idea why this helps, but it has helped both on my RAX80 and my RAX120. If doing this fixes the problem with speed, this suggests to me that it could be fixed in software, but from what I can tell, Netgear's firmware teams are scrambling to deal with a lot of problems (including some scary security problems with over 70 models). If this can be fixed in the firmware, who knows when that will actually happen.