A:Answer YES, but here is why you do not want to use it: Security!
According to the answer I got from an Optimum tier 2 tech, DOCSIS 3.0 will work with Optimum Cable in Eastern Carolina, as I have been using an older 16x4 channel version of this modem without issues for over 7 years. I am now upgrading my service from 500 Mb to 1Gb (an offer I cannot refuse), but I have to get a new modem to support that speed. When I mentioned Optimum's Website:
https://www.optimum.net/pages/optimum-certified-modems.html
that says Optimum only supports DOCSIS 3.1, he told me the reason is security. DOCSIS 3.1 is newer technology and that is still updated for security issues, where the older 3.0 is not. The tech recommended I upgrade to 3.1 for that reason alone, regardless if the new 3.0 modem may still work. Everything you do on line may be at risk due to unpatched security issues with DOCSIS 3.0. This is probably why the 3.0 modem is on sale and so cheap. It is outdated tech and no longer updated.