Visitor

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7 Messages

Thursday, April 9th, 2026 7:54 PM

Stable, robust and low-latency user-owned modem for 300/40 Mbps service ?

Hello, I'm looking to get a new low-latency and stable modem for my 300/40 Mbps service - and the key property of the modem I'm looking for is rock-solid stability with Xfinity's service, where I don't have to periodically reboot it or otherwise deal with it. Especially with my plan having no data cap, I might be using up to 2 - 3 TB of data per month. Therefore, with the 300 Mbps service, but with 2-3 TB of data use per month - which modem would you recommend based on your experience with your Xfinity-approved but user-owned modem ?

My current TP-link modem often starts having higher than normal latency (30 - 100 ms) after 3-4 days of use, after few 10's-100's gigabytes may have flowed through it. I then have to reboot it to restore the latency to 10-15 ms that it always gets with a freshly rebooted connection.

I will probably never go over gigabit speed for my service even if I upgrade my bandwidth above 300 Mbps. So I don't need high-bandwidth capable one - but instead need a robust one that doesn't degrade the service over time and after flow of data through it - and needing reboots.

Would appreciate experience-based recommendations ?

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Visitor

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2 Messages

16 hours ago

If you got to https://www.xfinity.com/support/internet/customerowned it will actually give you a list of ones you can use based on the services on your account. 

Typically I recommend though if your using your own equipment to have a separate modem and router. The issue with the all in one dealios is they are trying to be a bunch of things for a low price, modem, router, ethernet switch, firewall, and I find they typically just burn out after a while. 

If you want to do an all in one solution I've used the https://www.bestbuy.com/product/netgear-nighthawk-ac1900-router-with-docsis-3-0-cable-modem-black/J2VY7YTZHG before and it worked great. 

If you do want to go the separate router I usually recommend something like the https://www.bestbuy.com/product/arris-surfboard-sb6190-32-x-8-docsis-3-0-cable-modem-white/JX7YCY49XC and then you can pick up whichever router floats your boat. I have a pretty complicated Unifi network but I use an eero mesh system for my grandparents which is just a good value basic mesh Wi-Fi system that works really well for them. 

Most Coax modems will advertise right on the box what ISPs they support and you just want to match the advertised DOCSIS speed to make sure its enough for the plan level you have. 

I would also recommend checking in with support though, if the speeds are slowing down after a few days your modem might be loosing lock on some of the DOCSIS channels which reduces your avalible bandwidth. 

Official Employee

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3.4K Messages

15 hours ago

 

user_bees - Hello, and welcome! Thank you so much for joining us here on the forums. We’re glad you reached out for help with equipment recommendations. Choosing the right setup can feel overwhelming, and we’re happy to help make it easier.
Have you considered using an Xfinity Gateway? This is a great time to do so, especially since our newer internet plans now include the cost of the Xfinity Gateway; an incredible value built right in. Xfinity Gateways combine a modem and a high‑performance WiFi router into one convenient device, helping reduce cable clutter and making setup simple and stress‑free.
You’ll also enjoy Xfinity Advanced Security at no additional cost, which works around the clock to monitor your network and help protect against malware, phishing scams, and suspicious access attempts. Plus, renting a gateway gives you access to millions of Xfinity WiFi Hotspots nationwide, so you can save on mobile data when you’re on the go.
You can pick up a gateway at a nearby Xfinity Service Center, and if that’s not convenient, we’re more than happy to help arrange shipping as well. Just let us know what works best for you—we’re here to help every step of the way!

 

Visitor

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7 Messages

@XfinityThomasA​ Thanks, but I would like to use an user-owned modem.

Official Employee

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2.8K Messages

 

user_bees This link is more along the lines of what you are looking for. This will show you the approved modems as it pertains to our services and Next Generation Speeds if you live in an area that has had it's insfruastructure upgraded. We try to stay away from suggesting a specific modem or brand because we do not endorse any one modem in particular; we can only show you the modems that our services are compatible with.

 

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Visitor

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7 Messages

@XfinityBenjaminM​ Yes, I'm aware of that list - I'm just looking for other user's inputs of the most robust among them to get, so that I don't have to reboot it more than once a month or longer. 

Understand also that Xfinity cannot recommend any specific modem - so I'm hoping for inputs from any such technically-knowledgeable owner who might have had good experience with a specific user-owned modem - guarding against the issues of gradually degrading latency in particular.

Official Employee

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2.8K Messages

u/user-bees Ok! That is understood. We'll let our community chime in with their suggestions, and if you still need any assistance from us directly, please let us know.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
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