ARRIS (S34) - Cable Modem - Fast DOCSIS 3.1 Multi-Gigabit Cable Modem, for Comcast Xfinity, Cox, Spectrum & More, 2.5 Gbps Max Internet Speeds, 2 Year Warranty - (No Built-in WiFi) (Pack of 2)

Easy setup with Comcast and works with 2.5GB downstream and 300MB upstream package. Paired with the top end Netgear Orbi mesh system. Reliable and very fast.

This is the best DOCSIS 3.1 cable modem you can buy right now. Broadcom chip avoids issues with the Puma 6/7 based modems of the past. Certified/supports Xfinity Next Gen upload speeds. Form factor is nice and small. Unfortunately, you have to buy a third party bracket if you want to wall-mount this.

Easy set up. Works great. Lightening fast.

I ditched my ISP’s rented modem the day I upgraded to a 1.2 Gbps plan and never looked back. The SURFboard S34 is a clean, no-nonsense DOCSIS 3.1 modem with a 2.5 Gbps Ethernet port plus a bonus 1 Gbps port for link aggregation if your router supports it. Setup took under 10 minutes (activate on Xfinity/Spectrum/Cox app or phone call), and it’s been rock-solid ever since—no random reboots, no overheating, just consistent multi-gig speeds. Pros: • Real multi-gig capability — Hits 1.4–1.8 Gbps actual download on gigabit+ plans (tested with my own speed tests) • 2.5 Gbps + 1 Gbps ports — Future-proof and perfect for bonding or separate devices • 32×8 channel bonding — Locks on strong even in crowded node areas • Cool and quiet — Stays barely warm, vents well, no loud fans • Own-your-modem savings — Paid for itself in under a year vs $14/month rental fees • Easy activation on major ISPs (Xfinity, Spectrum, Cox, Mediacom) Cons: • No built-in router/WiFi — Pure modem, so you still need your own router (most people do anyway) • Pricey upfront — Not cheap, but cheaper than renting long-term • Link aggregation needs compatible router — Not everyone can use both ports at once If you’re on a gigabit or faster plan and tired of rental fees or sluggish ISP gear, the S34 delivers exactly what it promises: fast, stable, multi-gig internet with zero drama. One of the best modem upgrades I’ve ever made—5 stars, no hesitation.

Amazon was excellent—fast shipping, easy return, no complaints. This review is strictly about how Xfinity and the modem itself failed to deliver. I purchased the Arris S34 after receiving an email from Xfinity stating, “Your internet equipment can’t deliver the latest speeds… Find a compatible device today.” They linked to their own compatibility list, and the Arris S34 was clearly approved for my 1Gbps plan. So I replaced my reliable Netgear CM700, expecting better performance. Instead, speeds dropped, and the modem began flapping, frequent disconnects, slower throughput, and worse performance than the older CM700 it replaced. When I contacted support, Xfinity repeatedly claimed the S34 was “not recommended,” despite it being on their own list. They offered to send me their XB8 gateway and enroll me in their “Next Gen” plan, stating, “I can upgrade you to the new Gen plan, which offers 1000 Mbps + unlimited data for just $96.05, along with a new XB8 modem. You will also receive a $10 monthly discount if you enroll in Automatic Payments and Paperless Billing using your bank account.” That’s a price hike from my current $75/month—and they wouldn’t clarify what happens after the first 12 months. I asked that the S34 be removed from their recommended list. It’s misleading to approve a device publicly, then undermine it during support to push proprietary hardware. I’m returning the S34 and replacing it with a Motorola MB8600, which is also listed as compatible. If I’m treated the same way again, I’ll be switching to AT&T Fiber, which was recently installed in my neighborhood. At least they don’t play games with modem support. If you're buying this for Xfinity, be warned: the modem underperformed, and the ISP experience was even worse. Update: After I received the Motorola MB8600, Xfinity again refused to support it—despite it being on their approved list—and pushed me toward their proprietary XB8 gateway with yet another offer for “better speeds” and “lower prices.” I declined. Meanwhile, AT&T pulled fiber directly to my home. I connected it to my TP-Link router without a hitch. No drama, no games. Just fast, stable internet

It's a very good modem with blazing fast speeds with no lag or connection drops. Only issue is, this modem runs hot, at times so hot, that it will drop your Internet connection. The coax cable connection at the back even gets hot. So what did I do to solve this problem? I placed a 120mm router/modem cooling fan underneath. Here is the link to the fan that worked perfectly for this issue, NewHail Router Fan Cooler https://a.co/d/9twStR8. Once I placed this fan underneath, all the problems went away and I have my fan set on the lowest speed, which will definitely help with your fan lasting longer. I tried using the fan on all 3 speeds and they all kept the modem about the same temp. So that's why I decided to put the fan on the lowest setting. I would have given a 5 star review but because of this "only" issue. I gave it 4 stars. Motorola should've taken care of this issue instead of making us consumers come up with other alternatives for this issue.

I have only had this Modem for 48 hours, so this is a preliminary review. I have been a Cox Communications customer for over 20 years. The only problem I had with setting up this Modem was that the first customer service representative I spoke with did not properly save the HFC MAC ID number. So, initially there was no internet and this particular representative scheduled an appointment for a technician to come out. The next morning I called Cox back and spoke to an entirely different representative who caught the error, and now the Modem is up and running. I have only 1 Gigabyte service at the moment, but that is more than adequate for my needs. I have the router ethernet cable plugged into the 1G port. The Modem works just great. I am now able to access a website that is monitored by Cloudflare that I was not able to access with the previous outdated Modem. For the first 48 hours, I can say my internet connectivity and website access have considerably improved. Only time will tell how reliable this Modem really is. I believe it was a worthwhile investment - no more paying rent to Cox, and the Modem is "future proofed" for 2.5 Gigabyte service. I am thankful the second Cox representative was able to resolve the internet connectivity problem resulting from the incorrectly saved MAC ID number. If the conditions surrounding this Modem change, I will edit the review.

Works great

Habe meinen Internetzugang getrennt mit Modem + Router (FritzBox 6660), keine Abstürze mehr !