Product Use case Rating
Arris Surfboard SB6183 Best Cable Modem N/A
Zoom 5370 Best Value N/A
Netgear CM600 Best High-Speed Modem N/A

Best Cable Modems 2018

After testing more than a dozen cable modems, the Arris Surfboard SB183 is our modem of choice when you're tired of paying monthly rental fees to your internet service provider and decide to buy your own networking hardware. The SB6183 is a dependable modem that's compatible with a wide array of services and can handle the speeds most internet customers get these days. And you get a two-year warranty if anything goes wrong.

Looking to save money? The Zoom 5370, which works with many of the same ISPs as the SB6183, also features a two-year warranty and costs just a little bit less than our top-performing modem. If your home internet speeds top 300 Mbps, Netgear's CM600 modem is more reliable than its high-speed rivals, and its price has fallen below other 32 x 8 modems (32 downstream channels and eight upstream channels).

Latest News and Updates (May 2018)

While we think it's a good idea to keep your cable modem and router separate, Netgear offers a compelling counterargument in the form of its new Orbi Tri-Band WiFi Cable Modem Router System, which integrates a modem into our favorite mesh router. With Netgear's $300 CBK40, you'll get a 32 x 8 modem capable of delivering download speeds of up to 1.4 Gbps. The same device includes a router that can provide up to 4,000 square feet of Wi-Fi coverage. A dedicated backchannel keeps the Wi-Fi flowing without any slowdowns in speeds. Netgear is promising automated updates through its Orbi app to add new features and Wi-Fi improvements. Larger homes can get the CBK40 plus an extra satellite for $400.

Arris Surfboard SB6183: Best Cable Modem

The Arris Surfboard SB6183 is our top pick, since it's a dependable, 16 x 4 modem that will deliver solid performance for the majority of internet users. A two-year warranty gives it an edge over Netgear's modems, like the CM500, which are backed by one year of protection.

At 5.2 x 5 x 2.1 inches, the all-white SB6183 can be tucked 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 have to deal with that only when setting up the modem.

The SB6183 favors a simple row of vertical indicator lights that are easy 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 to see if there's any issue with your internet connectivity.

The SB6183 gets a largely positive response onAmazon, with more than 70 percent of 6,200-plus user reviews awarding a 5-star rating, thanks to its performance. (Note that Amazon appears to lump user reviews of multiple Arris products together, so pay attention to the reviews connected to the company's 16 x 4 modems if you're looking for feedback on the SB6183.) The negative reviews largely cite reliability issues that develop over time.

Zoom 5370: Best Value

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 alternative to Arris' device, especially since it's usually a few bucks cheaper. The Zoom 5370 is larger than the SB6183, but at 6.9 x 5.4 x 1.5 inches, it's still relatively slender compared with 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).

Around 400 people have reviewed the Zoom 5370 at Amazon, but the reviews are overwhelming positive. Users like the easy setup and reliable performance.

Netgear CM600: Best High-Speed Modem

Netgear's 24x8 CM600 modem enjoys the edge over rival high-speed devices for what it doesn't have — an Intel Puma 6 chip that's been blamed for some latency issues with other 32 x 8 modems such as the Arris SB6190. Opt for the CM600, and you're going to get reliable performance without the lags reported by some users with Intel Puma 6-powered devices. (Arris, which makes the high-speed SB6190, says it has put out a firmware update to address the issue, though ISPs roll out these updates on their own schedule.)

Netgear offers only a one-year warranty for its cable modems, but  the more dependable performance is worth the trade-off in this case. With the price of the CM600 falling below that of the SB6190, it's an even easier choice to make.

Other Modems Tested

Over the past few years, we've looked at many other cable modems that are still on the market. Here are the best remaining options based on our testing.

  • Netgear CM500: Think of Netgear's modem as the best of the rest when it comes to 16 x 4 modems. The CM500 is dependable and widely supported by ISPs, though it's taller than many modems. And Netgear offers only a one-year warranty.
  • TP-Link TC-7610: This 8 x 4 modem has a low price and delivers reliable performance for users with lower speed caps on their service, but its indicator lights are hard to spot.
  • Linksys CM3008: Another 8 x 4 modem, this model is noteworthy for its very compact design and easy setup. But it's pricier than comparable models, and its indicator lights are difficult to spot.

How We Test Cable Modems

We test each cable modem on Comcast's Performance Pro home internet service. After running speed tests to make sure the modems are delivering their promised download speeds, we use the modems as part of regular networking setup to gauge dependability.

We hook up each modem we review in our reviewer's home, using it as part of our networking setup. That allows us to verify a modem's compatibility as well as to get a sense of its dependability. Since price is also an important consideration when modem shopping, we also monitor retail sites for the best deals on the modems we've tested.

In addition to using the modems in a home with multiple connected laptops, smartphones and tablets, we also evaluate the indicator lights on each modem to see that they're visible. We look at how easy the modems are to set up. And because the primary reason to get your own cable modem is to save on monthly rental fees for ISP-supplied modems, we heavily weight the length of a modem's warranty.

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 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.

About DOCSIS 3.1

We haven't reviewed DOCSIS 3.1 modems because high-speed broadband is available in only some 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 1000 Mbps download speeds.

Check with your cable provider to see if DOCSIS 3.1 has been deployed in your area or if it's about to be. If so, consider some of the DOCSIS 3.1 options that modem makers have already announced. If DOCSIS 3.1 isn't in your immediate future, though, a DOCSIS 3.0 modem will serve your needs just fine.

Linksys and Netgear unveiled DOCSIS 3.1 modems at the start of 2017, and Arris followed suit with a model of its own in the 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 modem has 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 modem also features a pair of gigabit Ethernet ports for wired dedicated devices.

Motorola's DOCS 3.1 modem also has 32 download and eight upload channels. It also features Active Queue Management for speeding up page loads and gaming. Motorola says the modem's compatible with Comcast's Xfinity service as well as high-speed internet from Cox.

Cable Modems: Quick Buying Tips

When shopping for a cable modem, keep these four things in mind.

Compatibility: Confirm with your ISP that the modem you're looking at will work with the service your paying for. Most DOCSIS 3.0-certified modems should work with DOCSIS-based internet service, but it always helps to confirm.

Price and Warranty: You don't necessarily need to get the cheapest modem, but you should consider devices that pay for themselves within a year with what you save in rental fees. A year-long warranty is the bare minimum you should accept; two years of coverage is even better.

Design: Since most cable modems have the same set of indicator lights, you'll want one with easy-to-spot lights. Also, consider the size of a modem, since a compact design blends in more easily with your other networking equipment.

Speed: A 16 x 4 modem (that's 16 download channels and four upload ones) should do the trick for homes receiving service capped at 300 Mbps. Any faster, and you should go with a 24 x 8 or 32 x 8 modem, or a DOCSIS 3.1-compatible model if your ISP has upgraded to the new standard.

Cable Modem Buying Guide

Your monthly internet bill is likely $5 to $10 higher than it needs to be, thanks to the rental charge your ISP slaps you with for using one of its modems. Buying your own modem eliminates that cost, paying for itself in a year or less, depending on how much you’re already paying to rent that modem. (Comcast charges $10 a month, so you're looking at $120 in rental feels every year.)

When shopping for a modem, make sure that it's compatible with your ISP. Modem makers Arris and Zoom typically offer two-year warranties, which are better than the single year of coverage you'll get from companies like Netgear. Modems are generally available in black, though you'll find some in white; consider the ones that fit in with your decor and that don't take up too much space.

You may be tempted to buy a device that combines a modem and a router, but we think it's better to keep those two networking devices separate. If any part of a hybrid device fails, you're out both a modem and a router. It's also easier to upgrade individual networking devices, as routers add support for new networking features at a more rapid pace. That said, Netgear has just unveiled a new $300 version of its Orbi mesh router that includes a 32 x 8 modem, and we're interested to see if the promised software updates delivered via the Orbi app keep both the router and modem as up-to-date as Netgear is promising.

What Do Cable Modems Cost?

A 16 x 4 cable modem delivers enough speed to effectively serve the majority of cable customers. That kind of modem typically costs $70 or less. You'll pay more for high-speed modems, especially newer models that support the emerging DOCSIS 3.1 standard. But unless your internet provider is giving you the 1,000 Mbps speeds that DOCSIS 3.1 devices support, there's no need to pay the $180-and-up prices that these ultrafast modems command.

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  • InMesa
    Why don't they make modems with an indicator so a person knows when it needs to be replaced. Issues connecting to the internet could be the fault of the provider, router, modem, or the device that's trying to connect. It's a nightmare trying to troubleshoot where the problem is.
  • rgd1101
    Anonymous said:
    Why don't they make modems with an indicator so a person knows when it needs to be replaced. Issues connecting to the internet could be the fault of the provider, router, modem, or the device that's trying to connect. It's a nightmare trying to troubleshoot where the problem is.

    Like you said, it complicated, it will cost a lot more $ to build something that can troubleshoot itself
  • clabzor
    DO NOT USE SB6190 - Can't believe it is even being considered (much less any Puma 6 chipset)
  • seahag
    I think the graphic at the top is incorrect, it says SB1690, I think it should be SB6190.
  • shellbacksnipe
    None of this is relevant unless you tighten your coax F-connector on the wall plate and the back of the modem. If it's even slightly loose you've got ingress. Which means packet loss, slower speeds, modem resets, T3 timeouts, ect... So do yourself a favor and make sure those fittings are adequately tightened. Oh and one more thing. Don't go cheap on the coax cable. Use RG6 tri shield or better. 98% of internet trouble calls to your Cable ISP are caused by these two things.
  • coldwash
    Not what I would expect from a Best of 2018 review. Rehash of 2017 products with very little new insight. At the least focus on docsis 3.1 in more detail while updating purchase considerations for docsis 3.0. Arris modems while pushed like crazy have out of spec xmit power and can be very troublesome on a perfect gain cable signal through a top tier provider.
  • shellbacksnipe
    Anonymous said:
    Not what I would expect from a Best of 2018 review. Rehash of 2017 products with very little new insight. At the least focus on docsis 3.1 in more detail while updating purchase considerations for docsis 3.0. Arris modems while pushed like crazy have out of spec xmit power and can be very troublesome on a perfect gain cable signal through a top tier provider.

    What are you talking about? Out of spec US TX? If your Arris modem is out of spec it's not because of the device itself, it's because of crap wiring, crap splitters, crap f-connectors, or because some rocket scientist decided to connect their coaxial cable to a surge protector or UPS. Guess what? Your service drop is already bonded to your main electrical ground. It's NEC. It's mandatory. If you do that it's redundant and pointless. All you are doing is attenuating signal for no reason and causing a ton of other issues with ICFR, SNR, MER, BER, all of which impact your internet surfing/gaming/streaming abilities.
  • ek4man
    I was thinking of replacing the Comcast supplied cable router/modem. The issues we are having are constant rebooting needed (which most of these seem to take care of) and poor WiFi transmission distance. Which of these had the best WiFi coverage?
  • HowardMil
    I need a cable modem that has TELEPHONE- xfinity plan that will give me > than 500mbps download speed ( Blast).
    This is a tough task .
    Netgear Cv500v may not make it. cv1000 has no telephone. I will be upgrading my router to the ORBI or Asus or the STATE of Art Router in SPEED& WIFI at any price
    What options do I have with my Comcast telephone service??