7 Best Comcast Xfinity Approved Modems in 2023

Note, no device can get you faster internet speeds than your internet plan provides.

Also, get the device you need. A modem and a router are not the same things. Some types of internet require both others only one. If you are uncertain, click here

This is our article on the best compatible modems for Comcast Xfinity in 2023.

Go to the Full List.

Comcast Xfinity modem and router

As a Network Engineer, I have bought a bunch of modems to find out which one is the best for Xfinity.

And after much testing, I have concluded that Motorola MB8611 is the best modem for Comcast Xfinity. Because it’s fast, future-proof, and reliable.

Motorola MB8611
Source: Motorola.com

Motorola MB8611 – Editors Choice’s

Best Overall

  • Type: Cable Modem
  • Works up to: 2500 Mbps
  • Channel bonding: 32×8
  • DOCSIS: 3.1
  • Warranty: 2 years

But everyone has different internet needs and wants, so what modem you should get depends.

Thus, I have put together this list of the top 7 best Comcast Xfinity modems, so you can pick the one that fits you the best.

Keep reading to learn more.

7 Best Approved Xfinity Compatible Modems

Here are the best Comcast Xfinity modems.

  1. Best OverallMotorola MB8611 – Cable Modem
  2. Best For Voice ServiceNetgear CM2050V  – Voice Cable Modem
  3. Best Budget OptionMotorola MB7420– Cable Modem
  4. Best ValueNetgear Nighthawk C7800 –  Modem/Router Combo
  5. Best PerformerNetgear Nighthawk CAX80 –  Modem/Router Combo
  6. Best For Voice ServiceMotorola MT8733 –  Voice Modem/Router Combo
  7. Best Budget OptionMotorola MG7540 – Modem/Router Combo

Our Youtube Video on the Topic

Motorola MB8611
Motorola MB8611
  • Future-proof
  • Works for plans up to 2500 Mbps
  • 2-year warranty
Netgear CM2050V
Netgear CM2050V
  • Future-proof
  • Works for plans up to 2500 Mbps
  • Supports a 3-way conference call
Motorola MB7220
Motorola MB7420
  • Affordable
  • 2-year warranty
  • Easy setup
Netgear C7800 Info
Netgear Nighthawk C7800
  • Fast speeds
  • Decent range
  • Compatible with most cable ISPs
Netgear CAX80
Netgear Nighthawk CAX80
  • Future-proof
  • Very fast
  • Good range
Motorola MT8733
Motorola MT8733
  • Future-proof
  • Remarkably fast
  • Great range
Motorola MG7540
Motorola MG7540
  • Affordable
  • Vertical design
  • Easy setup

Top 7 Comcast Xfinity Compatible Modems

Here are the seven best Comcast Xfinity-approved modems with the best options for your circumstances. 

#1 Best Overall – Motorola MB8611

Motorola MB8611
  • Type: Cable Modem
  • Recommended for: Gigabit Extra or below (2000 Mbps)
  • Channel: 32×8
  • DOCSIS: 3.1
  • Warranty: 2 years


  • Future-proof
  • Works for plans up to 2500 Mbps
  • 2-year warranty


  • Sometimes excessive

The Motorola MB8611 is the perfect option for you with the Gigabit plan (2000 Mbps) or below that want to future-proof your modem.

The MB8611 is such a good cable modem because it’s both DOCSIS 3.1 and has a 2.5G ethernet port. 

This makes it future-proof because when Xfinity upgrades its internet to DOCSIS 3.1, you won’t have to go get a new modem. And since DOCIS 3.1 is backward compatible, it will work with DOCSIS 3.0. [1]

The 2.5GB ethernet port is also a great feature. Because this makes the modem compatible with internet plans up to 2500 Mbps

And even if it feels excessive today, it won’t be in a couple of years. 

Coming with a two-year warranty and excellent support (in my experience), I felt I couldn’t pick any other modem as the number one choice. 

You should, however, not get the Motorola MB8611 if you know that you will change to Fiber in the future. 

Because this modem is an investment for the future

Suppose you will get Fiber in a year or so. In that case, you should get a modem with the minimum requirements for your current internet plan (see table later in the article). 

Overall, the Motorola MB8611 is the modem you can buy and then ignore for the coming years. Because it will be enough for a long time. 

To learn more, read our full review of the Motorola MB8611

#2 Best For Voice Service – Netgear CM2050V

Netgear CM2050V
  • Type: Cable Modem for Voice
  • Recommended for: Gigabit Extra or below (2000 Mbps)
  • Channel: 32×8
  • DOCSIS: 3.1
  • Warranty: 1 year


  • Future-proof
  • Works for plans up to 2500 Mbps


  • Sometimes excessive

The Netgear Nighthawk CM2050V is a cable modem made for Xfinity’s Voice service. This is because it provides internet and has a phone jack, making it compatible with VoIP. 

It has two integrated phone lines that support a 3-way conference call, which means you can add a third person to your two-party conversation. 

Furthermore, it also supports call forwarding. This allows you to redirect incoming calls to other phone numbers. 

The modem also supports DOCSIS 3.1 technology. This, together with its 2.5G ethernet port, makes it capable of a staggering 2500 Mbps

A speed that Comcast doesn’t even offer yet. Enough to download nearly anything in mere minutes. 

It’s worth noting that this modem is not necessary unless you have Xfinity Voice and want extreme internet speeds. 

To learn more, read our full review of the Netgear CM2050V

#3 Best Budget Option – Motorola MB7420 – Cable Modem

Motorola MB7420
  • Type: Cable Modem
  • Recommended for: Performance or below (200 Mbps)
  • Channels: 16×4
  • DOCSIS: 3.0
  • Warranty: 2 years


  • Affordable
  • 2-year warranty


  • Not future-proof
  • Slow

The Motorola MB7420 is the best option if you’re on a budget and have the Performance internet plan (200 Mbps).  

The modem is “just enough modem” that will serve you well for now but is not future-proof.

The reason for this is because it’s DOCSIS 3.0 with only 16×4 channels. Which is the lowest requirement for a modem on Xfinity (recently changed from 8×4).

So do not get it if you plan to upgrade your internet plan anytime soon. 

Moreover, If you want a budget modem and have a faster plan than 200 Mbps. Motorola has another good option:

Any of these are great options if you’re on a budget and aren’t interested in future-proofing.

Link to Router Page

Need a Router To Your Xfinity Modem?

If you don’t get a modem/router combo, you might want a new router for your modem. Luckily, we got you covered in the best routers for Xfinity.

#4 Best Value – Netgear Nighthawk C7800

Netgear C7800
  • Type: Modem/Router Combo
  • Recommended for: Blast! Pro or below (800 Mbps)
  • Tested Wi-Fi Speed: 513.64 Mbps
  • Channel: 32×8
  • DOCSIS: 3.0
  • Warranty: 1 year


  • Fast Speeds
  • Decent range


  • Lacks features
  • High price

The Netgear C7800 is a good option if you looking for a gateway and has the Blast! Pro internet plan or below (800 Mbps). 

In testing, the Wi-Fi averaged 513.64 Mbps from 5 feet using the 5GHz band. 

Other measured speeds were 309.15 Mbps from 25 feet and 155.21 Mbps from 50 feet. These results are remarkable when considering it’s a Wi-Fi 5 router. 

Enough for a family of 5 people to watch 4K movies simultaneously without any problem. That is as long as your internet plan is fast enough, though. 

The modem is a DOCSIS 3.0 with 32×8 channels. This, unfortunately, doesn’t make it future-proof since it’s only DOCSIS 3.0. However, it still has great performance because of all the channels. 

In this device, the router is the limiting factor, not the modem. And the reason I only recommend this device for Blast! Pro is because the router only reached around 500 Mbps. 

And even with this, you likely won’t get the 800 Mbps you are paying for. So, you might want to consider a faster device if you have thee 800 Mbps plan.

Another drawback with the C7800 is the lack of features in the router. 

Because it lacks Parental controls, which allow you to restrict your kid’s activities on the internet. And QoS, which makes it possible to prioritize data on your network. 

Besides that, it’s a solid gateway that provides a lot of value for the money. 

To learn more, read our full review of the Netgear Nighthawk C7800

#5 Best Performer – Netgear Nighthawk CAX80

Netgear CAX80
  • Type: Modem/Router Combo
  • Recommended for: Gigabit or below (1200 Mbps)
  • Max Wi-Fi speed: 800+ Mbps
  • Channel: 32×8
  • DOCSIS: 3.1
  • Warranty: 1 year


  • Future-proof
  • Very fast
  • Good range


  • Lacks features
  • Expensive

The Netgear Nighthawk is one of the best gateways I have tested, and it will work for any Xfinity internet plan. 

We didn’t even find its max speed in testing since the internet plan we had access to was only 800 Mpbs. 

The testing results were 800+ Mbps from 5 feet, 583.15 Mbps from 25 feet, and 298.47 Mbps from 50 feet. All were using the 5GHz channel. 

These results are incredible for a modem/router combo and would be enough for more than a dozen 4K movie streams simultaneously

The biggest drawback of the CAX80 is the same as most other modem/router combos. It lacks extra features. 

This means that if you log into the router’s admin panel, you won’t be able to do much from there. 

Things like Parental controls or QoS, which allow you to restrict your kid’s activities online and prioritize data on your network, are nowhere to be seen. 

Furthermore, the CAX80 is honestly a bit excessive if you have an internet plan below 400 Mbps. 

But if you don’t feel like you need the extra features and are looking to get the speeds you are paying for, the CAX80 is a great option.

To learn more, read our full review of the Netgear Nighthawk CAX80.

#6 Best For Voice Service – Motorola MT8733

Motorola MT8733
  • Type: Modem/Router Combo
  • Recommended for: Gigabit or below (1200 Mbps)
  • Max Wi-Fi speed: 800+ Mbps
  • Channel: 32×8
  • DOCSIS: 3.1
  • Warranty: 2 years


  • Future-proof
  • Remarkably fast
  • Great range


  • Lacks features
  • Pricey

The Motorola MT8733 is a modem/router combo for you with any internet plan and Xfinity’s Voice Service.

To be honest, we haven’t tested this one. But we tested its brother, the MG8725, which is the same device except for the phone jack. 

This device reached 800+ Mbps from 5 feet (limited by my internet plan), 529.86 Mbps from 25 feet, and 289.32 Mbps from 50 feet. All were using the 5GHz band.

These results are great. Enough for any of Xfinity’s cable internet plans.

The range of the device also proved great. Reaching about 90-100 feet, enough for any except the largest houses. 

The MT8733 does, however, lack features. Things like QoS and Parental Controls are nowhere to be seen. 

Moreover, if you have a slower internet plan (100 Mbps or less), this modem/router might be excessive. For other options, go down to voice service in the buying guide.

#7 Best Budget Option – Motorola MG7540

Motorola MG7540
  • Type: Modem/Router Combo
  • Recommended for: Performance or below (200 Mbps)
  • Max Wi-Fi speed: 301.85 Mbps
  • Channel: 16×4
  • DOCSIS: 3.0
  • Warranty: 2 years


  • Affordable


  • Low range
  • Lacks features

If you don’t want to spend too much money and have the Performance internet plan or below (200 Mbps), the Motorola MG7540 is perfect for you. 

During testing, its Wi-Fi reached 301.85 Mbps from 5 feet, 102.38 Mbps from 25 feet, and 49.06 Mbps from 50 feet. All were using the 5GHz band. 

Considering its price, these are some pretty good results that would be enough for one to three 4K streams. 

The cable modem is DOCSIS 3.0 with 16×4 channels. This means that it will work as long as Comcast doesn’t change to DOCSIS 3.1. 

The biggest con with MG7540 is actually its range. Which, during testing, only reached around 70 feet. 

This should be enough for a normal-sized house if you place it somewhere closer to the middle, but honestly, it fits best for your average apartment. 

Overall, the MG7540 is a good cheaper option for anyone without too fast of an internet plan. 

To learn more, read our full review of the Motorola MG7540

Complete List with All Comcast Xfinity Approved Modems 

Here is a list of the Comcast Xfinity approved modems with every modem which is confirmed to be working on Xfinity internet.

BrandModel #With RouterChannelsDOCSISPuma ChipsetVoIP
Motorola MG8725Yes32×83.1NoNo
Motorola MT8733

SMC NetworksD3CM1604No16×43.0NoNo
TP-LinkARCHER CR500Yes16×43.0NoNo
TP-LinkARCHER CR700Yes16×43.0NoNo

Puma Chipset is a problematic chip some modems and routers use. I recommend avoiding models using it. “Yes” means that the modem uses it, and “No” that it doesn’t.

You can learn more about the chipset here.

What to Consider Before Getting a Comcast Xfinity Modem

Before buying a Comcast Xfinity-approved modem, there are some things you should consider to make the best choice possible. For a more general guide, check out the modem buying guide.

Modem/Router Combo Vs. Separate Devices

First, you should decide whether you want and router/modem combo (gateway) or separate devices. 

The difference is that gateways are a modem and a router put together in one device. While separate is one standalone modem and router which connects with an ethernet cable. 

Both options have their merits, but as a Network Engineer, I recommend getting separate devices. 

Because then you can change one device if it gets outdated or breaks rather than both. As well as providing better performance and more network control. 

This is not to say that gateways are without benefits. They are more convenient, require less setup, and have a generally lower upfront cost. 

And in the case of Comcast, there are plenty of good gateways to pick from. So if you want one you can buy one. 

Separate Pros

  • Better performance
  • Can change one device instead of both
  • More network control

Combo Pros

  • More convenient
  • Often easier setup
  • Cheaper upfront cost

If you are uncertain what to pick, check out the pros and cons of each option here


DOCSIS is the telecommunications standard cable modems use to deliver data to and from your home. [3]

Nearly all modems sold nowadays are either DOCSIS 3.0 or DOCSIS 3.1.

The difference is that DOCSIS 3.1 can deliver speeds up to 10 Gbps while 3.0 only provides speeds up to 1 Gbps.

Both options have pros and cons, but generally, DOCSIS 3.0 is enough if you don’t have a plan exceeding 1 Gbps.

But for Comcast Xfinity, I actually think getting a DOCSIS 3.1 modem is a good idea. Because it’s a way of future-proofing your modem for the expected speed increases.

DOCSIS 3.1 Pros

  • Future-proof
  • Faster
  • Lower latency

DOCSIS 3.0 Pros

  • Cheaper
  • Often enough

For a more detailed overview, check out DOCSIS 3.0 vs. 3.1 – which is best?

Channel Bonding

If you decide to get a DOCSIS 3.0 modem, you also need to consider how many channels you need. 

For a modem to be Xfinity-approved, it needs to have between 16×8 and 32×8 channels. 

The first number is the download channels, while the second one is the upload channels. This is why the second number is lower than the first one. Because most consumers use more downloads than uploads. 

As a rule, the more channels, the faster speed a modem is capable of. Even though you need to consider the DOCSIS protocol to pinpoint the exact capability. 

When picking a modem, you should consider what speeds you need and choose a modem where the channels fit your plan.

See the table under speed for some help. 


This ties into what DOCSIS protocol and channel bonding you should choose. Just make sure the modem’s speed matches or is above the speed of your internet plan. 

Also, note that the advertised speed isn’t real-world speed. But rather the maximum speed that modem can achieve in ideal circumstances. 

Something that never occurs outside the testing facility. 

A modem that is too slow for your internet speed will become a bottleneck for your internet. And speeds above what the modem is capable of is impossible. 

Here is a table showing what DOCSIS and channels are compatible with what Xfinity plan. 

Xfinity Internet PlanDOCSIS VersionChannels
Performance Starter (75 Mbps)3.0 or 3.116×4 or more
Performance Select (200 Mbps)3.0 or 3.116×4 or more
Performance Pro (400 Mbps)3.0 or 3.116×4 or more
Blast! Pro (800 Mbps)3.0 or 3.124×8 or more
Extreme Pro (1000 Mbps)3.1N/A*
Gigabit (1200 Mbps)3.1N/A*
Gigabit Extra (2000 Mbps)3.1N/A*
*DOCSIS 3.1 modem doesn’t use channels. 

Compatible with Comcast Xfinity

Before buying a modem, you need to ensure that it is Xfinity-approved. If you choose any of the modems listed above, there is nothing to worry about. 

As they are tested by Comcast and will work for Xfinity internet. [4

But if you want another modem that Comcast hasn’t approved, you must get a cable one. I would also recommend reading the comments to see if it works for other Comcast customers. 

But it still might not work for you, even if a cable modem is reported to work for Comcast. This is because the infrastructure differs somewhat in different areas. 

Therefore, I strongly recommend a Comcast-approved modem listed above. 

Ethernet ports

Another point to consider when getting a modem or a modem/router combo is how many and what type the ethernet is.

The standard Ethernet port supports 940 Mbps, while some newer ones can support speeds up to 2500 Mbps. 

A modem with a standard Ethernet port will not get more than 940 Mbps from it (unless you use Ethernet Aggregation). 

Therefore, I recommend you get a modem with the 2.5 Gigabit port because, for most,  the extra performance is worth the small extra cost. 

Suppose you get a modem/router combo and know that you use many wired internet connections. Then you should also take into consideration how many ports you will need. 

The C7800 has 4 Gigabit Ethernet ports, for example. 

Home Size

Depending on your home’s size, you need more or less Wi-Fi coverage. 

Therefore, if you decide to get a modem/router combo, you need to make sure the router signal is strong enough to reach all over your home. 

So if you have a larger home, you need a better router, while smaller homes can get away with a cheaper option. 

You could also use a Wi-Fi extender to strengthen your signal, but in my experience, it’s more convenient to get a better router simply. 

Xfinity Voice

If you have Xfinity Voice, you must ensure the modem you plan to buy supports VOIP (Voice over internet protocol). [5]

This is because you need a phone jack to connect the modem with your phone. 

If you want a separate modem and router, I recommend the CM2050V. And if you want a modem/router combo, get the MT8733

If you want more info about voice modems, read our article on the best voice modems

How To Set Up a Comcast Modem

To set up a cable modem:

  1. Pick a location with good air circulation. This is so the device doesn’t overheat. If you have a Gateway, place it close to the middle of the home, as high up as possible. This will improve its Wi-Fi coverage.
  2. Connect the Coax cable and the power cord. Also, connect it to a router with an ethernet cable if you have a standalone modem. 
  3. Follow the instructions manual that comes with the modem/gateway. 
  4. Activate your modem here.

If you have any problems with the setup, you can check out our guide on how to set up a modem with Xfinity

Rent Vs. Buy

Comcast has one of the most expensive renting fees out of all ISPs. It is at $14 a month, or $168 per year. Midco, for example, only has between $3 to $5 a month.

Therefore, I recommend most people buy their own modem or gateway if they are Comcast customers. Because the fees quickly add up to what a new device would cost. 

Even though the modem or gateway you get from Comcast is decent, many third-party options are better. 

That said, if you are about to move soon, renting for a couple of months might make more sense instead of buying. As the modem you buy might not work in your next location. Also, if you rent a modem, Comcast offers tech support and free replacements. 

So if you don’t like tech, you might want to consider renting, but otherwise, buying is better. 

Just note that I’m somewhat biased towards buying since I make a small commission if you do. 

For a more detailed overview, you can check out my guide on Rent Vs. Buy Modem & Router

Why Get a Comcast Xfinity Approved Modem

As mentioned, I recommend most people to buy their modem instead of renting it. And here are some of the main benefits of this.

No Monthly Fee

Comcast has a high renting fee that keeps rising. So, a big advantage of getting your modem is that you legally don’t need to pay the renting fee anymore. 

This will save you $168 a year, enough to buy a new modem every year. 

Faster Internet

You will also often experience faster speeds with a third-party modem than with the ISP’s modem. 

Even if Comcast’s devices are decent many other options are better. This will be especially noticeable if you get any of the top performers in the list above.

More Control and Features

Although Xfinity gateway offers many features like parenting controls and multiple networks, it still lacks in many areas. 

You can, for example, not prioritize programs or devices. 

Getting a third-party modem or gateway will give you more control over the device. It will also enable you to get devices with more advanced features. 



Here are some common questions regarding Xfinity modems and gateways. 

What is the best modem for Comcast Xfinity?

After much testing and talking to Xfinity, we concluded that the best modem for Xfinity is the Motorola MB8611. Because it’s a fast, future-proof cable modem for a fair price.

But if you want to see some other alternatives check out the article above.

Can I use my own modem with Comcast?

Yes, you can. You can find the list of all Comcast Xfinity-approved modems on their site or at the list in this article. 

Does Comcast (Xfinity) sell modems?

No, Xfinity only rents you modems. If you want one, you must buy a third-party option. 

My third-party modem doesn’t work. What should I do?

First, you need to check if it’s compatible with Xfinity. Do this by searching for the model number on the list of Xfinity-approved modems above.

Then you can check out their guide on how to troubleshoot third-party equipment.

How do I check if a piece of equipment isn’t supported?

You can check if Comcast approves it by either going to their site or searching for the model number in the table with all Comcast Xfinity-approved modems above. 

Can I use Third-party modems with Comcast Gigabit internet?

Yes, but you need to get a modem that has DOCSIS 3.1. And if you get Xfinity’s 3 Gigabit internet, you don’t need a modem since it’s fiber optic. 

My Xfinity internet is slow; what can I do to increase it?

The first thing you need to do is compare the internet speed you have to your current internet plan. You need to upgrade your Xfinity plan to get faster internet if it’s the same or close. 

If you measure a way lower speed than you pay for, check out our article on how to fix slow Xfinity internet

Our Verdict

Since Comcast is one of the largest internet providers in the US, it has plenty of compatible modems. 

So, there are many options. However, I have found that Motorola MB8611 is the best option for Xfinity internet. 

Because it provides a fast, future-proof internet connection for a reasonable price.

Was this article helpful?

27 thoughts on “7 Best Comcast Xfinity Approved Modems in 2023”

  1. Super informative article! I have a 1400 square foot townhome. Cutting cable and going to buy either modem router combo, or separate devices. Have Xfinity. All we do is watch/stream TV, and have 2 cell phones, and one tablet. Not gamers, nothing special. What is your recommendation for Xfinity internet plan/speed?
    Thank you!

    • Hi Marcia,

      Thanks for your comment.

      I would recommend their 200 Mbps plan. This will be enough to stream 4K and use the phones and tablet at the same time.

      You can learn more about Xfinity’s internet plans and what they are enough for here.

      Hope this helps!

  2. Was hoping for some advice, even with reading through this. I originally was looking at getting a modem that was also wi-fi, but now I’m not sure if I should and instead, if I should get a system that is a modem, with a home-kit router system. My house isn’t large, it’s 1,500SF (will be 1,800 with the renovation eventually), all one level, an L shaped rancher, but we also ran a ground rated cable out to my wife’s office to put a WIFi router out there as well, range is too far otherwise. My son’s are young now, but they’re big into gaming so I want to make sure we have reliable WiFi for them in the future and rather invest in that now than later.

    Would it be smarter to get a WiFi/Modem combo, or a Modem that I can connect a homekit to and have multiple WiFi receivers around the house (I need at least 2 ethernet ports if I go this route)? Assuming these kits plug in one port and that main unit projects to the other units?

    • Hi Leon,

      I recommend getting a modem and a normal router. For 1500-1800 SF, you won’t need multiple access points. If you get a high-performing router, like the ASUS RT-AX88U for example, you will be more than fine.

      A mesh system would, of course, also work. And yes, you need two ports, that is, if you don’t connect the units using Wi-Fi. Which will be slower but more practical.

      You could also get a modem/router combo, but as I explained in the article, I think a separate modem and router are better for most.

      I hope I understood your question. Let me know if you want me to clarify anything.

      – Andreas

  3. This was helpful info. I recently replaced my Xfinity modem/router combo with the Motorola MB861 and the Asus XenWiFi AX mesh system for my 3700 ft. four story townhome. My Comcast speed is 1200 Mbps. My previous router (Ubiquity Amplifi Mesh) maximum capability was 500 mbps. My speeds have increased, but I am experiencing occasional buffering, even moreso than when using Xfinity. I will check to see if there’s a problem with the equipment, but your information has been helpful and provided useful insight.

  4. Hello Andreas,
    Currently using Comcast Xfinity Upto 1.2 Gbps
    Equipment is a Netgear CM1100 Modem
    & Netgear R6300 Wifi Router.
    I’m having issues with speed and connectivity especially with the new IFit equipment just installed.
    Comcast blamed Netgear and Netgear blames Comcast. !
    I have noticed that the CM1100 is not listed for upto 1.2Gbps
    Looking to get your Pick – Motorola MB8611 and use the R6300 as wifi (Rated upto 1.3Gbps) Is this a suitable pairing or is the R6300 need to be replaced as well.
    Thanks for your time.

    • Hi Edwin,

      Yeah, the CM1100 will only give you 940 Mbps unless you use the link aggregation function it has. So you will need to either upgrade or start using link aggregation if you want to take full advantage of your internet plan. That said, you don’t have to if you don’t want.

      Your biggest problem right now will be the router. It’s simply nowhere close to what you need for a 1.2 Gigabit plan.

      I know they claim it’s 1.3 Gbps, but honestly, that’s just not true. You will at most get 200-300 Mbps from it. And I’m not even sure of that.

      Moving forward I would start by getting a new router. The ASUS RT-AX3000 or the ASUS RT-AX88U are both good options.

      But you can also check out our article on the best routers for Xfinity for more to choose from.

      And if you really want to take full advantage of your internet plan, I would recommend the Motorola MB8611 cable modem.

      Hope this helps and if you have any more questions let me know.


  5. Hi Andreas,

    Thanks for the article. I own MB7621 and didn’t have any major problems with it for a year. I recently switched from 200Mbps to 300Mbps and then all the problems started. My internet is not stable anymore, speed is not what I pay for and the most frustrating is that the internet is not only going between 50 to 100/150Mbps, but it goes off constantly. Working from home and needed to be online all the time, so this doesn’t help at all. It’s beyond frustrating. Our two work computers are hard wired.
    I had two technicians coming to my house, first changed all the fittings, the other one ran the brand new temporary line to our house. Nothing helped to have my internet stable as it used to be.
    Is my modem not able to handle this speed bump? Thanks for your thoughts.

    • Hi John, the MB7621 should be able to handle 300 Mbps without any issues, so I’m not sure.

      I assume you have tried resetting it and checked all the cables, but if not, that would be my first step.

      You can also log into the modem and check the log and see what it says. You might find something interesting there.

      It’s also worth making sure it’s not the router that is the issue. Try testing your internet directly from the modem to the computer and see if it still drops.

      I’m hesitant to recommend you get a new modem, as it might not fix it. But it also could be the solution. Sometimes DOCSIS 3.0 modem has problems with newer infrastructure.

      Let me know if anything helped, and if you have any other questions, let me know.

      • Hi Andreas,

        Thank you for your quick answer. I went to logs and found some errors there. After calling Motorola Support we found out that this is a ISP issue, since modem lacks communication through the cable. Now – at least – I have something in my hand when the next technician will come.
        Thanks again for your time and help!

  6. Hi Andreas. Thanks for sharing your research. I already own a Motorola MG8702 (modem/router combo) and I’m not thrilled with the speed that it provides. Would I benefit (increase bandwidth) by purchasing the MB8611 and attaching a separate router to it? Or do you think it would produce approximately the same speeds?

  7. Thank you very much Andreas for sharing your knowledge. After little research I found only very good reviews about MB8611. I got a MB8611, speed is indeed faster about 20mbps than with my old modem. It also helped to make up my mind faster. )
    Thank you.

  8. Thank you for sharing your detailed specs and hard work. I am an Xfinity customer and am leaning toward the Netgear CM2050V which supports telephony. However I am on a budget and am unsure about the best router to purchase. I had an Arris gateway for almost 2 years which recently stopped working.

    • Hello Dorothy, if you need a voice modem and are on a budget, you might want to consider the Netgear CM1050V. I do think it is less value for the money, but it is cheaper than the CM2050V.

      If you are looking for a budget-friendly router for your modem, consider the TP-Link AX10. You can also check out our article on the best routers for Xfinity if you want to see some other options.

      Thanks for your comment and if you have any more questions let me know 🙂

  9. Why do so many internet service providers in the US implement a system where an analog signal is converted to a digital signal. Why don’t they provide a direct digital link to your residence?

    My second question is why receiving internet via satellite link is so slow compared to cable/broadband services. I don’t see any satellite internet systems delivering gigabit speeds and above.

    I also noticed that certain nations overseas joke about the US and its definition of fast internet speeds (> 25 Mbps). A lot of overseas nations (e.g. Europe) have far faster speeds as part of their standard service plans, and for a lower cost.

    • Well, Mark, that quite a few questions. Let’s get started with the first one.

      You get analog signals into your home instead of digital because cable internet uses the Television infrastructure. And this infrastructure operates with analog signals.

      Your second question is why Satellite is so slow. Satellite internet feels so slow because of the great distance data needs to travel (i.e. from the data center to the Satellite and then to your device). This makes the latency of satellite internet very high.

      To your third question. Why is the US internet so slow compared to Europe. Well, this question has a lot of different answers. But my guess is that it’s because of the lack of competition. In most European countries, you can choose between plenty of different Internet service providers, while in the US, you often can only choose between one or two. That said, I don’t think the US is as slow as it often is portrayed as.

  10. This was a very helpful and thorough article – thank you! I am getting Xfinity Gigabit service next month, and will get the MB8611. I do have a random question though and wonder if you can help? I currently have Verizon FiOS, and at some point learned I could ditch their ‘device” which I think is a modem/router combo – I had to call them and ask them to change my profile to have their central switch location serve up my IP address, or something like that? So I did, and got an alternate router. It’s been working well for years now. Does this same approach apply to cable providers, meaning can I ditch the cable modem and go directly into a router? Not sure why I would want to do this, but am just curious.

    • Hi Jon, thanks for your comment. For Xfinity cable internet, you always need a cable modem. This is to translate the analog signal you receive into a digital signal that a router can understand.

      For Version FiOS, you have an ONT which is provided in the installation. This has a similar function to the cable modem, but for fiber. This is why you could connect directly to the router. So to answer your question, no, you can’t.

  11. Thank you Andreas for your hard work in giving us all this great info. I’m going to go with the Netgear CM2050V since I have the bundle with Comcast- voice. Though it’s more $$$ it’s what I need. Just got so tired of paying Comcast the modem fees. I had purchased and now returning the Netgear AX2700 as it’s not compatible with Comcast voice. I guess I didn’t read the fine print. Lol


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