Comcast has shown it can get 4Gbps full duplex internet speeds.
Comcast has shown it can get 4Gbps full duplex internet speeds.
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Comcast speed test shows 4Gbps upstream and downstream over cable

  • Posted byby Dean Takahashi
  • Updated
  • 3 min

Comcast, the largest U.S. provider of gigabit broadband Internet services, has demonstrated internet speeds greater than 4 gigabits per second (Gbps) in both directions over a cable network.

The test was conducted on Broadcom’s full duplex DOCSIS 4.0 chip, which will support future multigigabit upload and download speeds. By full duplex, it means that the upstream speed is the same as the downstream speed. Normally, most people can get access to a gigabit per second download speeds, but uploading crawls at maybe 20 megabits per second.

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Written by

Dean Takahashi

Dean Takahashi is editorial director for GamesBeat. He has been a tech journalist since 1988, and he has covered games as a beat since 1996. He was lead writer for GamesBeat at VentureBeat from 2008 to April 2025. Prior to that, he wrote for the San Jose Mercury News, the Red Herring, the Wall Street Journal, the Los Angeles Times, and the Dallas Times-Herald. He is the author of two books, "Opening the Xbox" and "The Xbox 360 Uncloaked." He organizes the annual GamesBeat Next, GamesBeat Summit and GamesBeat Insider Series: Hollywood and Games conferences and is a frequent speaker at gaming and tech events. He lives in the San Francisco Bay Area.