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The SB5100 uses the Broadcom chipset/processor BCM3348.
The SB5101 uses the Broadcom chipset/processor BCM3349.
The SB5120 uses the Texas Instrument chipset/processor TI4401.
Each modem has its own firmware versions unique to its model. All other product specifications are the same for all 3 models.
The SB5100 has been discontinued by Motorola.
The SB5101 has newer revisions & is still supported.
The SB5120 has been discontinued by Motorola.
You may also want to take a look at this post by Nerdtalker . ~sorto'
*This FAQ is based on user knowledge from a volunteer core of BroadbandReports' members. This FAQ in no way constitutes official information from Comcast or any of its affiliates.