RTGs powered Viking 1 and Viking 2 with 85 watts total, Pioneer 10 and Pioneer 11 with 165 watts total, and Cassini with three RTGs delivering 888 watts.
Pioneer 10 is the only spacecraft that headed toward the tail of the heliosphere and lost communication in 2003 at a distance of 12 billion kilometers from Earth.
Pioneer 10, Pioneer 11, Voyager 1, Voyager 2, and New Horizons are the five spacecraft that previously achieved solar system escape velocity.