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is modem arris sbg6400 compatible for xfinity comcast 400mbps internet service?

No its not. 


Will it work? Sure. But it won’t be able to hit full 400mbps. its modem isn’t capable of that. 


Indeed. Plmeans.  Slow plus can’t handle tv YouTube loading v fast. Getting a 3.1 for up to 100$


Some modems are capable but your internet provider won’t allow it on speed plan.  It’s always best to check your cable provider’s modem compatibility list  (http://mydeviceinfo.xfinity.com/).


@arosso7o1 what one did you pickup?