ARRIS (the company designing and selling the cable modems formerly under the Motorola name) introduced its flagship DOCSIS 3.1 cable modem available for retail sale from their website and Amazon.com. The cable modem brings the DOCSIS 3.1 standard to market, which means you can enjoy the higher speeds of cable Internet (if your ISP provides it) and not have to pay the modem rental fee.
The ARRIS SURFboard SB8200 is $199 on Amazon.com. With a $10 cable modem rental fee from your ISP, you can reach ROI in 20 months. It is approved to work with Comcast Xfinity and Cox cable Internet service at this time.
The modem’s implementation of the DOCSIS 3.1 standard allows it to reach a maximum (not necessarily what your ISP will provide) of 5 Gbps download and 262 Mbps upload. It achieves this by bonding 32 channels for download and 8 channels for upload. The modem also offers two gigabit ethernet ports. The SB8200 is backwards compatible so you can buy it for DOCSIS 3.0 and be ready if/when your ISP upgrades to faster speeds.
The Netgear CM1000 is the only other DOCSIS 3.1 modem listed on Amazon, at a price tag of $179.