Personally if Spectrum in your area is using DOCSIS 3.1 then I would buy a modem that is DOCSIS 3.1. Just my two cents.. The more channels you have to bond the better. In time everyone will have to have a 3.1 modem. We use to own the cable company here and have sold out to Charter Spectrum. And DOCSIS 3.1 is what I would go with as long as Spectrum will allow you to have it.. This varies by location and what is allowed by Spectrum in your area..
Overall you'll be fine with what you have going. If your ISP is supporting the speeds and modem currently then keep it. Just know that they may require you to go with a newer model modem that supports more channels. As time goes one, older 4x4 or 8x4 modems will no longer be supported as ISPs will improve there systems for faster speeds that support higher channels, 24 and 32 and DOCSIS 3.1 is becoming the norm going forward. So for now, if your getting to spec speeds with the 7610, and your ISP lets you use it, then keep it going. Just keep in mind, any changes in the future may require a different modem capabilities.
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