5 Best Comcast Xfinity Cable Modem (2017) |  Reviews

Best Comcast Xfinity Compatible ModemBeing the biggest cable operator in the United States of America, most people prefer Comcast to other companies for internet service provision. Comcast has for a long time boasted about the ultra efficiency and superb quality of its services.

However, the majority of the customers of the Internet service provider are usually dissatisfied with the cable modem that they get as a component of the subscription package. Comcast has realized this and has suggested a list of the best cable modems that their customers can use to substitute with what is found out of the box.

Therefore, it is paramount to know about the best modem for Comcast Xfinity as indicated by the internet service provider.


5 Best xfinity compatible modems Comparison Guide

Adapter's NameDownload Speed channels Ethernet PortsPriceCheck Now!
ARRIS SURFboard SB6141
ARRIS SURFboard SB6141

(4.4 / 5)
343 Mbps
8 download & 4 upload
4x Ethernet

Linksys cable modem (CM3024)
Linksys cable modem (CM3024)

(4.3 / 5)
960 Mbps
24 download & 8 upload
1x Ethernet

ARRIS SURFboard SB6121r
ARRIS SURFboard SB6121

(4.4 / 5)
172 Mbps
4 download & 4 upload
2x Ethernet

Motorola 16x4 Cable Modem
Motorola Cable Modem

(4.5 / 5)
686 Mbps
16 download & 4 upload
1x Ethernet
NETGEAR CM600 cable Modem
NETGEAR CM600 cable Modem

(4.3 / 5)
24 download & 8 upload
1x Ethernet


Why you buy Cable Modem for Xfinity and save $150 per year

Although as a new Comcast subscriber you will get a cable modem in the subscription package and of course pay monthly rental fees for it, it is more efficient and economical to buy a new cable modem to substitute the out-of-the-box one.

Comcast has various internet subscriptions which are meant to offer fast internet speeds. However, that doesn’t happen practically and you as a customer can be frustrated by the slow connections. The ISP isn’t to blame for these issues but rather the modem that you are using.

To solve this, you need to buy a new faster cable modem that will be compatible with Comcast. You can always count on the following cable modems that match Comcast Xfinity for superfast internet connections:


8 Best Comcast Xfinity Compatible Modem review

ARRIS SURFboard SB6141 – Affordable Cable modem for comcast

ARRIS SURFboard SB6141 DOCSIS 3.0 Cable ModemBy supporting IPv4 and IPv6, ARRIS SURFboard SB6141 is compatible with most of the largest cable providers in the United States. Depending on the provider of your cable internet service, the cable gives you an opportunity to enjoy excellently fast download Wi-Fi and upload speeds to a maximum of 343 Mbps and 131 Mbps respectively, thanks to its DOCSIS 3.0 and 802.11ac technologies.

The beam forming utilized by this modem allows you to stream your favorite videos and play online games from any area of your home at ultrafast speeds. Use the cable’s pre-set Wi-Fi security to secure your network from malicious intrusion.


What We Liked?

  • Depending with your Internet service provider Arris Surfboard ensures that you enjoy fast download and upload speeds of up to 343 Mbps for downloads and 131 Mbps for uploads.
  • It can work with a wide rage of internet service providers such as COX TWC and Comcast.
  • It has a very simple installation process. Therefore, you must not be techie for to set up Arris Surfboard modem.
  • Has pre-configured Wi-Fi security to ensure that your network is free from malicious unauthorized access.

What We Didn’t?

  • The device is a cable modem only. It doesn’t comprise a Wi-Fi router , neither does it have a VOIP Telephone adapter.


Final Verdict

  • Arris Surfboard has supersonic speed. This enables the user to perform online tasks without experiencing low connectivity. It is recommendable to users who perform multiple tasks on internet because of its multiple channels. However, its lack of power button is a disadvantage to some users.


Linksys (CM3024) – Best Cable modem for online gaming

Linksys High Speed DOCSIS 3.0 Cable ModemLinksys DOCSIS 3.0 Cable Modem has added more fun to the playing of online games, streaming HD videos and surfing the web, because of its incredibly fast Wi-Fi speeds to a maximum of 300Mbps. You can use the modem on all main providers of cable services due to its wide-range compatibility.

Therefore, with this modem, you will save some bucks that you would have otherwise used on modem monthly rental fees. Replacing your old modem with Linksys DOCSIS 3.0 Cable Modem is a piece of cake since its setup process is incredibly easy. Besides, the modem comes with a comprehensive and easy startup guide.


What We Liked?

  • It works with all main cable providers.
  • With high WI-FI speeds of up to 300 Mbps it enhances fast downloads.
  • It is a 24×8 cable modem that delivers a stable internet connectivity hence reducing internet congestion. Additionally, the user can enjoy simultaneous live media streaming as well as web browsing.
  • It is easy to setup because there is no CD required.

What We Didn’t?

  • It lacks a battery backup incase of power failure.


Final Verdict

  • With a supersonic speed of up to 300 Mbps Linksys CM3024 is ideal for high bandwidth transfer rates which make it to be a good option for heavy downloads, video streaming and online gaming. However its lack of a back battery can lead to a setback incase of a power failure.


ARRIS SURFboard SB6121 – Cheap Cable modem for comcast

ARRIS SURFboard SB6121 DOCSIS 3.0 Cable Connect ARRIS SURFboard DOCSIS 3.0 Cable Modem to your computer or router using Gigabit Ethernet port. Then, download what you need on the Internet at unbelievably high speeds of up to 172 Mbps. You will finish uploading a file within a brief time over the modem’s four upload channels at speeds up to 131 Mbps.

The router offers you one of a kind online gaming and video streaming experience. No more dead spots in your network area; you will be able to access fast internet connections everywhere within your network. This modem matches all the main cable service providers such as Comcast among others.


What We Liked?

  • It is compatible with major U.S cable providers like Time Warner, Mediacom and Cox.
  • It has download speeds of up to 172 Mbps download and 131 Mbps upload. This makes it possible for online streaming and gaming.
  • It has 4×4 channels that reduce internet congestion. This means that it offers reliable internet access.

What We Didn’t?

  • It does not have a wireless router. This means that it can only offer wired internet connections.


Final Verdict

  • ARRIS SB6121 is compatible with major cable providers. This makes it to be compatible with major US Internet providers. With 4×4 channels, online video streaming is an effortless affair. Besides, these numerous channels reduce internet congestion. However, it lacks a wireless router prompting the need to buy a router and a modem separately, hence additional costs.


Motorola MB7420 -Elegant and Unique in Looks 

Motorola 16x4 Cable Modem, Model MB7420

Enjoy reliable and fast internet connections with speeds up to 686 Mbps, thanks to Motorola 16×4 Cable Modem, Model MB7420.The modem has an Ethernet port that allows you to connect your TV, wireless modem as well as play station to your cable network. Once you get this modem, you won’t break your back while trying to use it since its set up process is extremely easy and it is well described in a simple quick start guide.

A compact shape is something about this modem that should excite you especially if you have limited space in your house and you fear that a large-sized modem can fall off due to congestion. Besides, this modem has an alluring design that will most probably match your interior décor.


What We Liked?

  • It enhances reliable and fast internet with speeds of up to686 Mbps.This allows the user to take shortest time possible to perform tasks on the internet.
  • It has an Ethernet port that allows internet connection to your TV, play station as well as WI-FI connection.
  • It has 16 download channels and 4 upload channels which make internet fast and reliable.

What We Didn’t?

  • It has no in-built router.


Final Verdict

  • Motorola MB7420 has multiple advantages among them being its reliability, fast internet and provision of multiple services to the user .This makes Motorola MB7420 the first choice for any internet user as a result of its advantages over other types of modem. However, this model lacks in- built wirelessrouter and the user may be forced to buy the router in a separate package.


NETGEAR CM600 – high speed cable modem for comcast

 NETGEAR CM600 (24x8) Cable Modem DOCSIS 3.0

With maximum cable internet speeds of 960Mbps, NETGEAR CM600 (24×8) Cable Modem DOCSIS 3.0 ensures that you enjoy quick and high-end streaming of HD videos, lightening-speed downloads, and ultrafast online games. Its set up process includes very easy-to-understand user web interface which helps you have the modem operating within a very short time without having to call the support team for assistance.

The dual-band technology of the modem offers you uninterrupted internet connections throughout your home. The modem’s USB port allows you to connect your printer or storage device to your network. Additionally, you can control the access to your network by setting up a guest network for some of your users.


What We Liked?

  • It is compatible with most of internet service provider. This enhances flexibility while choosing your ISP.
  • NETGEAR CM600 manages network congestion well. This means that it is capable of accommodating the performance of multiple tasks online without experiencing internet connection snags.
  • It ensures a high internet speed for ultra-fast downloads, among other online tasks.
  • The USB port in the modem allows the user to connect their printers or storage device to their network.

What We Didn’t?

  • It has only one gigabit Ethernet port.


Final Verdict

  • NETGEAR CM600 is unique in that it has a port that allows the user to connect his/her printer or storage device to his/her network. It is a lightning-fast speed modem. And its set up process is easy and simple saving the user time to call for assistance from customer care.


TP-Link N300 300Mbps Wi-Fi DOCSIS 3.0 Cable Modem Router

TP-Link N300 DOCSIS 3.0 (8x4) Wireless Wi-Fi
It is your time to say goodbye to modem rental fees by grabbing TP-Link N300, a wireless and cabled modem router. Apart from being certified for Comcast’s Xfinity, the modem is also compatible with numerous internet providers such as Suddenlink, WOW, Cox, Mediacom as well as Spectrum which comprises of Time Warner Cable , Bright House Networks, together with Charter.With this modem router combo, you’ll be able to stream videos, download files and play online games at ultra-fast wireless speed to a maximum of 300Mbps. It offers upload and download speeds of up to 143Mbps and 343Mbps, respectively.

The downstream channel bonding of this combo involves a maximum of eight channels while the upstream bonding entails up to four channels.



What We Liked?

  • You mustn’t be a techie for you to install this combo; it is relatively easy to install.
  • It is ideal for users who need networks with Wi-Fi speeds of at most 300Mbps.
  • It is compatible with various internet service providers.

What We Didn’t?

  • Since it comes with a modem and a router as one set, a breakdown of one of the components will prompt the need to replace the entire unit.


Final Verdict

  • The compatibility of this router/modem offers you the flexibility of switching from one ISP to another without having to buy another router or modem. The combo is a good option if you want Wi-Fi connections with speeds not exceeding 300Mbps. However, be ready to replace the entire unit if any of the two components fails to operate.


ARRIS SURFboard SBG6580 Dual Band Router

ARRIS SURFboard SBG6580 DOCSIS 3.0 Cable Modem
Again, ARRIS SURFboard Cable Modem/ Dual Band Router offers you an opportunity to avoid the costly modem rental fees. Comprising of a DOCSIS 3.0 cable modem and an N600 Wi-Fi router, the purchase of this combo saves several bucks as it is cheaper than buying a router and a modem separately.The modem router combo works pretty well with various ISPs including Comcast Xfinity, Cablevision, Time Warner Cable, Cox, as well as Charter, among others. It has eight download channels plus four upload channels with a capability of offering download speeds of up to 343 Mbps and fast upload speeds to a maximum of 131 Mbps.

It offers Wi-Fi speeds of up to 600Mbps. The modem router combo requires cable internet service. Unfortunately, its Wi-Fi features may not work well with particular internet service providers including CenturyLink, AT&T and Verizon.



What We Liked?

  • It is a good option for those people who need networks with Wi-Fi speeds of up to 600Mbps.
  • It is compatible with several internet service providers.
  • The router comprised in this set has four gigabit Ethernet ports for simultaneous connection of multiple wired devices to your network.

What We Didn’t?

  • It doesn’t work with CenturyLink, AT&T, or Verizon.


Final Verdict

  • Its compatibility with several ISP gives its users the flexibility of choosing their preferred providers without having to buy another modem or router. However, you shouldn’t give this combo a thought if you intend to switch to CenturyLink, AT&T, or Verizon without having to buy another modem or router.


NETGEAR C3700 N600 Wireless Router

NETGEAR N600 Wi-Fi DOCSIS 3.0 Cable Modem Router (C3700)
NETGEAR C3700 is a set comprising of a N600 wireless router and DOCSIS 3.0 Cable Modem. It boasts a certification proving its compatibility with various cable internet providers including Comcast’s Xfinity, Spectrum, Suddenlink, Cox, Mediacom as well as Optimum.However, it lacks compatibility with, AT&T, CenturyLink Verizon as well as Cable Bundled Voice Services. It offers super-fast wi-fi speeds to a maximum of 600 Mbps on its two simultaneous bands (300mbps on each band).

The modem in this unit supports reliable download speeds which are eight times faster as compared to a DOCSIS 2.0 modem. The router has guest access feature for separate and secure access by your network’s guests.



What We Liked?

  • It offers ultra-fast Wi-Fi speeds of up to 600 Mbps.
  • It is suitable for HD video streaming, fast downloads and online gaming.
  • It doesn’t confine you to only one cable internet providers. You can choose any among Comcast’s XFINITY , Spectrum, Suddenlink, Cox, Mediacom as well as Optimum.

What We Didn’t?

  • The router/modem lacks compatibility with AT&T, CenturyLink, Verizon as well as Cable Bundled Voice Services.


Final Verdict

  • NETGEAR C3700 is a good choice for people who are interested in networks with interference-free Wi-Fi speeds of up to 600 Mbps. With this unit, you shouldn’t worry about the security or unauthorized access to your network since it has guest access feature. With the guest access feature, you can create a separate account for your network’s guests. However, the combo isn’t an appropriate choice for the users who intend to use cable internet services from AT&T, CenturyLink or Verizon.


What to know before buying a modem for comcast

After spotting a cable modem to purchase, you need to confirm if it is going to offer you the value that you are looking for. You should consider the following before you part with your cash:

  • Compatibility with your cable provider: Not all modems work with all cable providers. It can be frustrating to buy one only to find that it isn’t compatible with your ISP. Therefore, it is paramount to check whether the modem appears in the ISP’s list of the compatible modems before you make a purchase. If the provider doesn’t have the list, get relevant information from customer forums or enquire it from the customer care representative.
  • Speed: With fast a fast modem and fast cable Internet plan, you will be able to enjoy fast internet connection speeds. You can know how fast a modem is by confirming whether the modem utilizes DOCSIS 3.0 technology, which helps cable modems offer high internet speeds.
  • Reliability and efficiency: It is vital not to rely only on the modem’s approval by Comcast. Seek to find further information from the relevant customer reviews about the reliability and efficiency of the modem.


Reasons for purchasing a cable modem router combo for accessing the internet connection from Xfinity

You’ll most likely come across a modem/router set as you look for a modem for your network. The router/modem unit offers you an opportunity to buy a modem and a router in one box. The two will function from the same box, performing their respective functions.

You’ll undoubtedly like the fact that the combo have fewer wires, is easier to set up and has less clutter as compared to buying the two components independently. It looks like a great idea, right? But, wait! In fact, given a chance, I would discourage you from buying this set.

The major drawback of this unit is that you’ll have to replace the whole of it in case you need to upgrade your router. On the other hand, upgrading an independent router is less costly and easier as it won’t interfere with the functioning of your modem.


Buying of a used modem for accessing Comcast connection: Is it a good idea?

As much as it may seem to be a cheap option, don’t even think about buying a used modem for accessing Comcast internet connection.

There are high chances a modem that’s not new may have been used by another Comcast user, hence added to their accounts.

The other user may be from a different state from where you reside and their account is normally closed. However, the MAC address of the modem remains in their account.

Therefore, you won’t be able to delete the MAC address from the account, hence the inability to add it your account since the address is limited to a single account.

For that reason, you will have to take the used modem to a cable store of Comcast for its verification and addition to your Comcast account.

Compare ARRIS SURFboard SB6141 DOCSIS 3.0 Cable Modem

Linksys High Speed DOCSIS 3.0 Cable Modem Vs Arris SURFboard SB6121 DOCSIS 3.0 Cable Modem Vs Motorola 16x4 Cable Modem MB7420 DOCSIS 3.0 Vs NETGEAR CM600 24x8 Cable Modem DOCSIS 3.0

NameARRIS SURFboard SB6141 DOCSIS 3.0 Cable Modem Linksys High Speed DOCSIS 3.0 Cable ModemArris SURFboard SB6121 DOCSIS 3.0 Cable ModemMotorola 16x4 Cable Modem MB7420 DOCSIS 3.0NETGEAR CM600 24x8 Cable Modem DOCSIS 3.0
ImageARRIS SURFboard SB6141 DOCSIS 3.0 Cable Modem Linksys High Speed DOCSIS 3.0 Cable Modem, Certified for Comcast/Xfinity, Time Warner, Cox & Charter (CM3024)Arris SURFboard SB6121 DOCSIS 3.0 Cable ModemARRIS SURFboard SB6183 DOCSIS 3.0 Cable ModemNETGEAR CM600 24x8 Cable Modem DOCSIS 3.0
Editor Ratings (4.3 / 5) (4.3 / 5) (4 / 5) (4.5 / 5) (4.3 / 5)










Download Speed343 Mbps960 Mbps172 Mbps686 Mbps960 Mbps
BandsDual BandN/aDual BandFull BandN/a
Ethernet Ports2 – Gigabit Ethernet Ports – 10/100/1000 MbpsN/a1 Ethernet PortN/aGigabit Ethernet port
channels8 downstream and 4 upstream24 download & 8 upload 4 downstream and 4 upstreamN/a24 downstream and 8 upstream
SupportsIPv4 and IPv6 IPv4 and IPv6 IPv4 IPv4 and IPv6 IPv4 and IPv6

Final Verdict

  • You shouldn’t continue paying high monthly modem bills while experiencing annoyingly slow cable internet connections. Get the value of your money and replace your slow modem with a one-time purchase fast modem that will make you forget about all your internet issues. Choose the modem which is efficient and reliable, as well as the one that matches your cable internet plan and cable internet service provider.