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: Major ISPs like Xfinity , Spectrum , and Cox have shifted their networks to DOCSIS 3.1 and 4.0.

: Even if supported, DOCSIS 3.0 modems often struggle with plans above 300–400 Mbps. In real-world conditions, a gigabit plan on a 3.0 modem often performs like 400 Mbps. DOCSIS 3.0 vs. 3.1: Key Differences DOCSIS 3.0 vs. DOCSIS 3.1: What's the Difference?

: Many providers no longer allow the activation of new DOCSIS 3.0 devices on their networks.