Best Modem Router Combos for Cable Internet: Which One to Buy

For most cable customers on a plan up to about 1 Gbps, the Arris SURFboard G34 or G36 is the sensible modem-router combo, customers on faster plans suit the G36 or the Wi-Fi 7 SURFboard G54, and anyone who wants a lower-cost unit for a modest home can look at the Motorola MG8702. A combo saves space and a power outlet, but it ties your modem and Wi-Fi together, so it fits small to mid-size homes better than large or heavily wired ones.

What a combo is, and who it suits

A modem-router combo, sometimes called a gateway, puts a cable modem and a Wi-Fi router in one box. You connect the coax line from the wall, and the same device creates your home network. Compared with two separate devices, it uses fewer cables, takes less shelf space and is easier to set up. The cost is flexibility: if the Wi-Fi side ages, you have to replace the whole unit, and you cannot place the modem near the coax outlet and the router in the center of the house.

Buying your own combo also avoids the monthly equipment rental that providers commonly charge. Review sites often frame this as the main financial argument for owning, though the amount depends on your provider and is not stated here. Make sure the device is on your provider’s approved list, because compatibility varies by company and speed tier.

At a glance: cable combos compared

Arris SURFboard G36: the most commonly recommended mid-tier

The G36 pairs a DOCSIS 3.1 modem with AX3000 Wi-Fi 6. The maker lists channel support for both DOCSIS 3.1 (two downstream and two upstream OFDM channels) and DOCSIS 3.0 (32 by 8), one 2.5 Gbps Ethernet port, and four 1 Gbps ports. It is described as certified by CableLabs and qualified by Cox, Comcast Xfinity and Charter Spectrum. Coverage is listed as up to 2,500 sq ft, which suits apartments and many mid-size houses. ModemGuides names it the best combo for gigabit and faster plans because of its 2.5 Gbps port.

The 2.5 Gbps port matters if your plan is faster than gigabit: otherwise a gigabit port would become the ceiling on a wired connection. The maker notes there is no digital voice service, so customers who use their provider’s phone line should look elsewhere.

Arris SURFboard G54: Wi-Fi 7 and multi-gig

The G54 adds Wi-Fi 7 (BE18000), a 10 Gigabit Ethernet port and four 1 Gigabit ports, with the maker stating support for plans up to 10 Gbps and coverage up to 5,000 sq ft. It carries the same approval message as other SURFboard models for the major cable providers, with a reminder to confirm with your own provider. It suits buyers on top-tier plans, or those who want a router that will not feel dated soon. WiredGuide names it the best overall for future-proofing. For most customers on a plan under 1 Gbps, the extra capability will not show up in daily use.

Arris SURFboard G34: the value alternative

ModemGuides calls the G34 the better value for plans up to 1 Gbps. It is a step below the G36 in port speed. If you are on a plan of a few hundred Mbps and live in a smaller home, it is a likely fit, but read the maker’s specification sheet for ports and Wi-Fi details before deciding.

Motorola MG8702: an older but still sold option

The MG8702 combines a DOCSIS 3.1 modem with an AC3200 4×4 Wi-Fi 5 router. Its manual lists support for DOCSIS 3.1 and backward compatibility with 32 by 8 DOCSIS 3.0, four gigabit LAN ports and a USB port (sources disagree on the USB version). It is approved for Comcast Xfinity, Cox and Charter Spectrum according to listings. Wi-Fi 5 is a generation behind, but the unit remains a low-cost route to owning your equipment. It fits a home with average coverage needs and a plan that does not exceed gigabit speed.

Netgear Nighthawk CAX30S and other combos

Roundups name the CAX30S as a Wi-Fi 6 combo with AX2700 dual-band wireless that works with Xfinity, Spectrum and Cox on plans up to 2 Gbps. Because the maker page did not load, treat those details as reported rather than confirmed. The Arris SBG8300 appears in some lists as a gigabit-rated model, though reviewers mention occasional connection drops. Spectrum customers should note that a roundup says the 2 Gig plan still requires provider-supplied equipment.

Compatibility checklist before you buy

• Provider list. Look up your provider’s approved-device list. Xfinity, Cox and Spectrum each publish theirs, and not every device is approved for every speed tier.
• Plan speed. Match the device to the highest speed you pay for, and check the Ethernet port speed if you wire a computer.
• Phone service. If you use provider voice service, confirm the device supports it. The G36, for instance, is stated to have no digital voice capability.
• Home size. Compare the rated coverage with your floor area, and remember that walls reduce it. Larger homes may need a separate mesh system.
• Activation. You usually activate through the provider’s app or customer support using the serial number and MAC address.
• Warranty. The G36 and MG8702 are listed with two-year warranties.

Combo or separate modem and router?

If you later want a mesh system, many combos can be set to a bridge or modem-only mode, but the exact steps are in each maker’s manual and not every model supports it. Standalone modem picks that appear in ModemGuides’ list include the Arris SURFboard S34, the Hitron CODA56 and the Arris SB8200 for gigabit plans.

Pick X if you…

Frequently Asked Questions

Is a modem-router combo a good idea for cable internet?

For small and mid-size homes it is a convenient choice with fewer devices to manage. For large homes or people who want to upgrade Wi-Fi often, a separate modem and router gives more flexibility.

Do I need DOCSIS 3.1?

For gigabit-class plans, yes, since DOCSIS 3.1 is the standard those plans use. Older DOCSIS 3.0 models are limited in speed, so choose 3.1 unless your plan is small and your provider still supports the older type.

Will these work with Xfinity, Spectrum and Cox?

The G36 is listed as qualified by Cox, Comcast Xfinity and Charter Spectrum, and the MG8702 is listed as approved for the same. Approval can vary by speed tier, so confirm on your provider’s current device list before purchase.

Can I use my own combo to avoid rental fees?

Yes, buying approved equipment generally lets you return the rented gateway. Make sure the new device is activated first, and keep a record of your return.

Does Wi-Fi 7 matter on a cable combo?

It helps if you have Wi-Fi 7 devices and a fast plan. Otherwise a Wi-Fi 6 combo like the G36 is usually enough, and the rest of the budget can go to placement or a mesh extension.

What if my home is larger than the rated coverage?

Add a mesh extension or move the combo to a central spot. Some combos can switch to modem-only mode so you can pair them with a mesh system, so read the manual of your model.