AX4200 versus AC3000

[Jimanator]

I just ordered an AX4200.  I've been using an AC3000 for a few years.  I recently upgraded to ATT fiber and expect I will see an overall improvement in WIFI speed with the AX4200 (ATT fiber is up to 1 gig)?  Any other improvements I should gain by moving to the AX4200 from the AC3000 or did I make a bad upgrade purchase?

[FURRYe38]

Well you get AX mode over AX. Back haul speeds are 2400Mbps vs 1733Mbps. 

Theres no USB ports on Orbi AX systems. 

Might compare the spec sheets between the two.

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

What is the size of your home? Sq Ft?
What is the distance between the router and satellite(s)? 30 feet is recommended in between RBR and RBS to begin with depending upon building materials when wirelessly connected. https://kb.netgear.com/000036466/How-far-should-I-place-my-Orbi-satellite-from-my-Orbi-router

[Jimanator]

Home size = 3700 sq.ft.

Modem is an ATTU-verse, model 5368AC

[FURRYe38]

Your modem already has a built in router. What mode is it working in currently?  When you get the Orbi system in, its recommended to bridge or use the DMZ/IP Pass thru on the modem for the Orbi router if you want to use the Orbi as a router. 

This would be a double NAT (two router) condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT
https://kb.netgear.com/30187/How-to-fix-issues-with-Double-NAT
Couple of options,
1. Configure the modem for transparent bridge or modem only mode. Then use the Orbi router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the Orbi router gets from the modem. Then you can use the Orbi router in Router mode.
3. Or disable all wifi radios on the modem and connect the Orbi router to the modem, configure AP mode on the Orbi router. https://kb.netgear.com/31218/How-do-I-configure-my-Orbi-router-to-act-as-an-access-point and https://www.youtube.com/watch?v=H7LOcJ8GdDo&app=desktop

Some historical reading on ATT modems:

https://community.netgear.com/t5/Orbi/Installing-Orbi-behind-ATT-Pace-5268AC-gateway/td-p/1234191
https://community.netgear.com/t5/Orbi/Netgear-Orbi-and-ATT-Pace-5268-Router/m-p/1786833/highlight/tr...
https://community.netgear.com/t5/Orbi/ATT-fiber-BGW210-and-costco-RBR50-RBS50/m-p/1868313#M83488
Modem FW may have broke good speeds between the modem and Orbi in router mode:
https://community.netgear.com/t5/Orbi/RBK50-Speed-Throttling-Wired-and-Wireless/td-p/1673291/jump-to...

https://community.netgear.com/t5/Orbi-AX/Orbi-AX-6000-and-AT-amp-T-fiber-gateway-issue/m-p/1890125/h...

[Jimanator]

I'm already using he Orbi system with the ATT router.  My only change would be going from an Orbi AC3000 to an AX4200.  I was just asking about the performance between the two units.

[Bandito]

In my experience, you'll see no improvement in the performance of your existing AC clients, but can see a bit of a performance boost with any WiFi 6 clients that you may have.  So, overall, you'll see little change in your wireless network performance.

[FURRYe38]

Just checking the mode on your Modem. It already has a built in router. Having two routers on the same line can be problematic. 

Good Luck.