Ones you might not have heard of
-Earnie Shavers
-Bon Foster
-Archie Moore had a lot of knockouts but I don't think his ratio was great.

Ones you probably have heard of
-Tommy Hearns.
-Prince Nassem Hamed
-Rocky Marciano
-Joe Louis
-Lucas Matthysse
-Manny Pacquiao
-Mike Tyson
-Vitali Klitschko
-Wlad Klitschko