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Picking a Cable Modem for Xfinity

There are a lot of cable modems on the market, and many are compatible with Xfinity service.

However, that doesn't mean that every modem is perfect.

My basic requirements are:

  • Currently certified by my ISP.  Buying a cable modem that isn't currently certified is simply unlikely to work.
  • Capable of supporting needed service speeds.  Buying a cable modem which cannot deliver the service needed is going to be an immediate bottlebeck.  Buying a cable modem which is far more capable that the service speed is likely a waste of money,
  • No built-in WiFi capability or Telephone line capability.  A personally-owned WiFi router is likely a better choice than an all-in-one unit that will need to be positioned exactly where the cable is within the house. 
  • Don't over-buy.  Cable modems do not last forever.  Manufacturers abandon support, and cable modems aren't infinitely durable due to things like lightning strikes and being powered on for years at a time.

So what are the good modems?

Assuming a very high speed plan (more than gigabit), at this point there are only two modems that meet my criteria:

Why?  Because these are the only modems that meet all of my requirements:

  • Appear on Xfinity's NextGen Speed Tier list (as of June 26th)
  • Appear on Xfinity's "Recommended" list (as of June 26th)
  • Have a 2.5 Gbit Ethernet port
  • Do not have WiFi or an "analog" Telephone port

Which one to get?  They all mostly use the same class of chipsets.  I'd get the cheapest. Shop around, as prices change.  Used modems are often good deals, as they are often just store returns that have seen little to no usage.

Slower plans

For slower plans, which is what most people should have, I recommend getting the very cheapest that meets the service plan.  For example, I bought a Arris SB6190 that can be purchased used for about $20. It has been working perfectly for years. 

Other options and ideas

  • If the plan includes a "free modem", consider using it.  Free is a good price, and the free modems are usually good.
  • For a small apartment, an all-in-one modem/wifi router might do the trick.
  • If service has been troublesome, perhaps stick with the leased modem so the provider can't pass the buck when the service isn't working well.
  • When buying, remember that your purchase may not last forever.  
    • The manufacturer may abandon the device
    • The ISP may change their technology, leaving your device obsolete
    • A new service provider may emerge with a better deal
    • You may move and end up with a new ISP
    • Your device might fail due after the warranty expires, or due to an incident 

 

 

 

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