Best Cable Modems 2017


A cable modem might seem like the last device you'd need to worry about buying. After all, most internet providers include a modem as part of your setup, seemingly saving you the trouble of having to shop for one more device. But in most cases, you're paying for that convenience, as your provider might be charge you a monthly rental fee on your modem.

Over time, those fees can really add up. Comcast charges $120 a year if you rent one of its modems. Buy your own, though, and you'll have paid off the cost of that modem in rental fee savings long before the year is out.

If you’re tired of tacked-on modem rental fees each month, the Arris Surfboard SB6183 is our top overall pick. The modem is compatible with a wide array of internet services, and it can handle speeds that most internet customers are getting these days. While the modem is listed for $99, you can usually find it for less. A two-year warranty on the SB6183 protects your investment.

If  your internet service caps download speeds at 100 Mbps, the TP-Link TC-7610 remains a good value at $42. Arris’ Surfboard SB6141 is also a capable modem at those speeds, though this older device is getting harder to find.

Does your ISP offer speeds faster than 300 Mbps? We recommend the Arris Surfboard SB6190 for the fastest internet connections. It’s a 32 x 8 modem (32 downstream channels and eight upstream channels) in a compact design and comes with a two-year warranty.

Why Buy Your Own Cable Modem

Here's what you'd pay over the course of five years if you rented a cable modem from your ISP instead of buying a $99 SB6183 or a $65 Zoom 5370. (And remember, that’s the list price; you can usually find that modem for less online.)

Internet Service Provider
Year 1 Cost
Year 2 Cost
Year 3 Cost
Year 4 Cost
Year 5 Cost
Total Cost Over 5 Years
Comcast Rental Fee
$120
$120$120$120$120$600
Cox Rental Fee
$84
$84
$84
$84
$84
$420
Optimum Rental Fee
$60
$60$60$60$60$300
Surfboard SB6141 Retail Cost
$55
$0
$0
$0
$0
$55
Surfboard SB6183 Retail Cost
$99
$0
$0
$0
$0
$99

Monthly rental fees for cable modems can cost you dearly each year. Comcast charges customers $10 a month if it supplies them with a cable modem; that's $120 a year on top of the internet service you also pay for. Other internet providers charge less each month, but their costs still add up over the course of a year and beyond. Buy your own modem, though, and you pay that cost just once. Just make sure to check your cable bill once you buy your own modem to make sure your ISP drops that monthly charge.

A Comcast customer who opts for the SB6183 will have covered the cost of renting a modem after 10 months (and that assumes they pay full price for the modem). The savings are even more immediate with lower-priced options like the Zoom 5370 or Netgear CM500.

MORE: Opinion: I Hated Time Warner Cable, But I Came Back for Spectrum

It's more complicated for customers who get their internet service from Charter and its new Spectrum service, which includes former Time Warner Cable and Bright House customers. Spectrum internet service includes a modem as part of your subscription. (There is a $5 monthly Wi-Fi fee if you want to go wireless, so if you own both your modem and router, you can avoid that monthly Spectrum charge.) You can still use your own modem, provided it's compatible with Spectrum's service, but you won't reap savings the way Comcast subscribers can.

Monthly rental fees for cable modems can cost you dearly.

There's a trade-off when you strike out with a modem of your own. That ISP-provided modem you're renting receives tech support from your internet provider, who will offer a replacement if your current rental ever gives up the ghost. Buy your own modem, and you're on your own for tech support, as far as your cable company is concerned. That's why we recommend modems with a two-year warranty.

If the speeds of your internet service tier increase, your ISP will likely upgrade your equipment for free if you’re renting. People who own their modem will have to take care of their own upgrades — and some ISPs have been quite pushy about telling users to upgrade their modem.

None of this should dissuade most people from ditching their rented modem — not when you can save $140 or more after just two years of owning your own device — but those trade-offs are worth keeping in mind. And if you bundle your home telephone service with your internet, you may have to use the modem your ISP issues, so double-check with your provider.

What Modems We've Tested

We focus on DOCSIS 3.0-compatible modems in our testing and research. DOCSIS, or Data Over Cable Services Interface Specification, is a telecommunications standard that cable TV operators use to provide internet service over the same wiring that's serving up your favorite TV shows. Released nearly a decade ago, the DOCSIS 3.0 specification added support for multiple channels to boost speeds, and major internet providers have upgraded to that standard.

Our recommendations now focus on 16 x 4 modems — those are devices with 16 downstream channels and four upstream channels — since they can support internet plans that deliver download speeds up to 300 Mbps. And 16 x 4 modems don’t cost that much more than 8 x 4 modems, which are best on plans with download speeds that top out at 100 Mbps.

We have looked at a trio of more powerful modems — the 24 x 8 Netgear CM600 and Linksys CM3024 as well as the 32 x 8 Arris SB6190 — but unless your internet plan offers lightning-fast speeds, these $100-plus modems are likely overkill for your needs.

In the future, internet providers will upgrade to DOCSIS 3.1 and its 1000 Mbps download speeds, but unless you live where it's being deployed — Comcast is picking up the pace at adding DOCSIS 3.1 markets — and you're paying up for gigabit internet, you're better off sticking with a DOCSIS 3.0 modem.

If you have taken the gigabit internet plunge, a couple companies do offer DOCSIS 3.1 modems capable of taking advantage of faster speeds while also saving you from that monthly cable modem rental fee; we highlight those in a special section below.

Keep Your Modem and Router Separate

Some manufacturers offer modem-router hybrids — Linksys, for example, just released the $200 CG7500 dual-band modem and router. While it's tempting to kill two birds with one hardware stone, keep in mind that if any part of a hybrid device fails, you're out both a modem and a router. Having a modem-router combo also complicates upgrading, since routers tend to add support for new networking features at a more rapid clip than modems do. We also test and rate routers, and we can recommend the best router for your needs.

MORE: Modem vs. Router: How They're Different and What They Do

What to Look for in a Cable Modem

We base our cable modem recommendations on four factors.

Compatibility: The most appealing cable modem in the world won't be much good to you if your internet provider doesn't support it. We've listed the compatibility of the modems we've tested with some of the largest internet providers, as well as what tiers of service are supported. (Some modems that work perfectly fine at lower-speed tiers aren't supported if you opt for a faster level of service with your ISP.)

Should you decide to buy your own cable modem, you should first confirm with your ISP that your top choice will work with the service you're paying for. Note that the lack of official support doesn't necessarily mean a modem won't work with a given ISP. A modem maker told us that modems that are DOCSIS 3.0-certified by the industry R&D firm CableLabs should work with a DOCSIS-based internet service.

Modem Compatibility with Providers

Modem
Comcast
Spectrum
Cox
Optimum
Cable One
RCN
SB6183
Xfinity Extreme 250/300 and lower
Speeds up to 300 Mbps
Ultimate tier and lowerSupported
Supported
Speeds up to 330 Mbps
CM500
Xfinity Extreme 250/300 and lower
Speeds up to 300 Mbps
Ultimate tier and lower
Supported
Supported
Speeds up to 330 Mbps
Zoom 5370
Xfinity Extreme 250/300 and lowerSpeeds up to 300 MbpsUltimate tier and lower
Not Listed
Not Listed
Speeds up to 330 Mbps
TP-Link-7610Xfinity Extreme/Blast and lowerSpeeds up to 100 MbpsPremier tier and lowerSupported
Supported
Speeds up to 155 Mbps
SB6141
Xfinity Extreme/Blast and lowerSpeeds up to 100 MbpsPremier tier and lowerSupported
Supported
Speeds up to 155 Mbps
Zoom 5345
Xfinity Extreme/Blast and lowerSpeeds up to 100 MbpsPremier tier and lower
Supported
Supported
Speeds up to 155 Mbps
CM400
Xfinity Extreme/ Blast and lower
Speeds up to 100 MbpsPremier tier and lower
Supported
Supported
Speeds up to 155 Mbps
DCM-301Xfinity Extreme/ Blast and lowerNot Listed
Premier tier and lowerNot Listed
Not Listed
Speeds up to 155 Mbps
CM3008
Xfinity Extreme/ Blast and lowerSpeeds up to 100 MbpsPremier tier and lowerNot ListedNot ListedSpeeds up to 155 Mbps
SB6190
Xfinity Extreme 250/300 and lowerSpeeds up to 300 MbpsUltimate tier and lowerSupported
Supported
Speeds up to 330 Mbps
CM600
Xfinity Extreme 250/300 and lowerSpeeds up to 300 MbpsUltimate tier and lowerSupportedSupportedSpeeds up to 330 Mbps

Design: Most cable modems have the same set of indicator lights: a power light, lights that tell you the status of your send and receive channels, a light indicating whether you have internet connectivity, and a link light that shows if your modem is connected to a computer, router or other device. You'll want a modem that displays these lights in a clear, easy-to-spot way in case you have to troubleshoot any connectivity problems. You'll also want to consider the footprint of a cable modem; a compact design makes it easier for a modem to blend in with your other networking and cable equipment.

Consider whether your modem can support the speed of your internet service.

Price and Warranty: The primary reason to drop your ISP-supplied modem in favor of one you own outright is to save money over the long term. While that doesn't mean opting for the cheapest modem you can find, you'll still want to look for one with a price tag that's low enough to pay for itself in less than a year with what you'll save in rental fees. Why a year? Because some modem makers provide a year's warranty with their devices, though we favor modems that come with two years of warranty coverage.

Speed: Consider whether your modem can support the speed of your internet service. A 16 x 4 modem is likely to support whatever your ISP throws at it, unless you happen to pay for download speeds greater than 300 Mbps. If your service is capped at 100 Mbps, an 8 x 4 modem will work just fine, though a 16 x 4 device gives you more headroom should you ever upgrade your service.

As for performance testing, it’s really a non-issue. To confirm, we hooked up an SB6183, a Zoom 5370 and a CM500 to a Comcast account with Performance Pro internet service, which tops out at download speeds of 100 Mpbs. We then ran Ookla’s Speedtest.net, and while the SB6183 had the fastest average, all turned in speeds over 113 Mbps. The bottom line: little distinguishes modems by performance, so pay more attention to compatibility, price, warranty and design.

Arris Surfboard SB6183: Best Cable Modem


The Arris Surfboard SB6183 is our new top pick, replacing the venerable SB6141. Arris’ 16 x 4 modem retains all the charms of its 8 x 4 counterpart, but with more channels to handle faster internet tiers. It’s a dependable modem that will deliver solid performance for the majority of internet users. A two-year warranty gives it an edge over Netgear’s modems, which are backed by one year of protection.

I’m a big fan of the compact design of Surfboard modems, and the SB6183 is no exception. At 5.2 x 5 x 2.1 inches, the all-white SB6183 tucks unobtrusively next to a router, cable box and whatever other hardware you have on hand. The coaxial cable connector is a little too close to the power connector for my taste, but you’re likely to only have to deal with that once.

The SB6183 favors a simple row of vertical indicator lights that are easier enough to spot, though the yellow lighting can be a little hard to see if your modem’s in direct sunlight. Still, it’s pretty easy to glance at the SB6183 and see if there’s any issue with your internet connectivity.

The SB6183 gets a largely positive response on Amazon, with more than 70 percent of 5,200-plus user reviews awarding the SB6181 a 5-star rating, thanks to its performance. The negative reviews largely cite reliability issues that develop over time.

TP-Link TC-7610: Best Value

If the ultimate goal of buying your own modem is to save money, consider TP-Link's TC-7610, but only if your internet service is capped at 100 Mbps for downloads, as the TC-7610 is an 8 x 4 modem. The SB6141 remains a very capable 8 x 4 modem — it’s the one still keeping my house connected to the internet — but new versions of that Arris modem are becoming harder to find, while the TC-7610 can be had very inexpensively.

That low price seems to be the biggest reason for the TP-7610's warm reception on Amazon, where 72 percent of the nearly 2,000 customer reviews give the modem 5 stars.

The TP-Link modem performed reliably when we tested it, and it works with Comcast, Cox and all the ISPs that make up Charter's new empire.

The TC-7610 stands upright — it measures 5.6 x 4.5 x 2.3 inches — so don't expect to place it in a compact space. Its pinpoint-size white-and-green indicator lights may also put off some users: They're a little hard to spot; though if you don't like your networking equipment to flash like a Christmas tree, you probably won't mind. You'll get a two-year warranty with the TC-7610, so you won’t need to sacrifice coverage for that attractive price tag.

Zoom 5370: Slim Design

More internet providers list compatibility with the SB6183 than the Zoom modem, but if the 5370 is supported by your ISP, the 16 x 4 modem is a good, lower-cost alternative to Arris’ device. The Zoom 5370 is larger than the SB6183, but at 6.9 x 5.4 x 1.5 inches, it’s still relatively slender when compared with other bulkier modems. And its all-black look may fit in better with your other internet hardware.

I particularly like the 5370’s indicator lights, which are good and bright. More important, they’re clearly labeled, instead of making you rely on icons to let you know what light shows which function. A power button in the back makes resets easy, and gives you a one-press option for cutting off internet access (something parents might appreciate if their kids spend dinner glued to their devices).

Fewer than 400 people have reviewed the Zoom 5370 at Amazon, but the reviewers are overwhelming positive. Users like the easy setup and reliable performance, and you can likely get a 5370 for less than an SB6183 while still enjoying the protection of a two-year warranty.

Netgear CM500: A Solid Choice

At $70, Netgear’s 16 x 4 modem costs less than the SB6183, and it enjoys wide compatibility with internet service providers. On the downside, Netgear offers only a one-year warranty on the CM500.

Netgear’s CM500 is taller than the SB6183 and Zoom 5370, at 7.3 inches. I also found its indicator lights difficult to see, though at night, you may appreciate the lack of a light show.  The coaxial and power connectors are also far apart on the CM500, making this an easy modem to set up.

Amazon customers who bought the CM500 are generally pleased with its setup and performance, giving the modem an average rating of 4.2 stars. Nearly three-quarters of the almost 1,600 reviews on Amazon are of the 5-star variety.

High-Speed Modems: What You Need to Know

We’ve looked at a trio of modems that offer a little more horsepower than their 16 x 4 counterparts, but with 16 x 4 devices capable of handling up to 300 Mbps download speeds, only a sliver of internet users will need to pay for performance beyond that.


Should you find yourself in that select crowd, the 32 x 8 SB6190 ($129) is probably your best choice, thanks to its compact size (it’s roughly as big as the SB6183) and two-year warranty. The other 24 x 8 modems we’ve tested — the CM600 from Netgear and the CM3024 from Linksys — are more massive modems. The 8.7 x 5.3 x 2.4-inch CM600 ($129) looks like a sideways star cruiser, while the 8 x 7 x 1.8-inch CM3024 offers a striking tiled look; at $100, the Linksys modem is also the cheapest of this high-powered trio.

DOCSIS 3.1: The Future of Modems

We haven't reviewed DOCSIS 3.1 modems because high-speed broadband is available in only select markets, and even then, some providers don't yet allow you to bring your own DOCSIS 3.1 modems. Still, with Internet providers expanding gigabit internet, modem makers are beginning to offer DOCSIS 3.1 devices that can deliver faster networking speeds. Linksys and Netgear unveiled DOCSIS 3.1 modems at CES in January, and Arris followed suit with a model of its own this spring. Linksys has since put the launch of its CM3132 modem on hold, but other DOCSIS 3.1 devices are now available.

Netgear's CM1000 is backward-compatible with DOCSIS 3.0 for internet users who want to upgrade early. The $179 modem has already been certified by Comcast for use with its internet service.

Arris bills the Surfboard SB8200 as a future-facing modem, capable of handling streaming ultra HD and high-performance gaming with its 32 download and eight upload channels. It promises twice the speed of a DOCSIS 3.0 modem — at least if your internet service is capable of supporting that. The $199 modem also features a pair of gigabit Ethernet ports for wired dedicated devices.

Other Modems Reviewed

We’ve evaluated a bunch of 8 x 4 modems over the last two years, and because modems are basically a commodity, they remain widely available. Here’s a quick rundown of these different devices and what we thought about each one.

Modem
Price
What We Liked
What We Didn't
Average Amazon Customer Rating
Zoom 5345 $44.90 Amazon Two-year warranty; visible indicator lightsMinor setup complains4.4 stars
Netgear CM400 $44.99 Amazon Visible indicator lights; competitive priceUsers cite reliability issues in online reviews3.7 stars
Linskys CM3008 $50.74 Amazon Compact design; easy setupIndicator lights aren’t always easy to spot; pricey compared to other 8x4 modems4.3 stars
D-Link DCM 301 $42.89 Amazon Easy-to-spot indicator lights; reliableOne-year warranty; not listed as supported by some ISPs4.4 stars

Credit: Philip Michaels/Tom's Guide

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