Modem upgrade needed?

Xfinity sent me an email telling me I need to upgrade my modem so that I can gain full advantage of download speed.  I have the Performance Level internet from Xfinity, rated at 175Mbs.  My current modem is a Motorola SB6121, specs say it can handle maximum of 195Mbs for downloads.  When I do "speed tests", depending upon the server (I tested 7 servers), my download speeds range from 75 to 95.  

Given the above, would a new modem achieve faster download speed ?

Thank you for your comments.