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I just purchased my new Modem model SBG8300. I have Xfinity speeds up to 800mbps and upload speed of 200mbps. But with this modem I get 300mbps download and like 10mbps upload. 
 

Any help or advice?

Xfinity doesn’t support 200mbps on third party devices right now. So doubting your upload a bit. 

And what device are you testing with because its usually the wifi device you’re testing on that bottlenecks. 

What wired speeds do you get? 

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