I have an older Motorola Surfboard which supports DOCSIS 3, and does 4x4 bonded pairs. I am currently on Cox Preferred Internet. Would I see any speed increase if I purchased a modem that supported 24x4 or even 8x4 bonded pairs?
I assume you have an SB6120 or 6121, both are Cox approved up to Preferred level of service. What speeds are you currently getting with a wired connection? What router do you have connected to the modem? Since the 4x4 modem can handle the 50+Mbps of Preferred, if you are not getting those speeds something else may be wrong. If everything is working properly, upgrading to more channels shouldn't give you a speed increase but will future-proof you system somewhat. You will be ready for an upgrade to a higher level of service or any future Cox speed increases.