Xfinity Speed is 1.4gbps; Orbi only testing 940mbps. What gives?

[rbr750issues]

I have an Orbi RBR750 with Orbi RBS750 satellite.

Xfinity just let me know that my connection has been upgraded to 1.2gbps. To archieve that, I've just installed a new gateway from Xfinity set up in bridge mode with the Orbi attached via LAN.
What I'm confused about though is that the gateway's speedtest is consistently reading 1.4gbps while the Orbi's internal speedtest maxes out at 940mbps no matter what I do.

Is there a hardware reason why an Orbi RBR750 wouldn't be able to achieve the full 1.4gbps potential on a single connection? Was wondering if it's an issue of the advertised 4.2gbps being the combination of four cat5 ports vs. what is possible on a single port's connection.

Thanks for any help from networking pros

[FURRYe38 · Accepted solution]

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

You'll not see anything much over 900Mpbs on the wire thru the Orbi AX. Lan port connection rates are limited to 1000Mpbs max. 

Now if you have WiFi AX supporting devices, then you may see over 1000Mbps. Depends on MIMO antenna support though.

[FURRYe38 · Accepted solution]

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

You'll not see anything much over 900Mpbs on the wire thru the Orbi AX. Lan port connection rates are limited to 1000Mpbs max. 

Now if you have WiFi AX supporting devices, then you may see over 1000Mbps. Depends on MIMO antenna support though.