The Blues crashed to a fifth straight Super 15 defeat, against the Cheetahs, to end their remote hopes of a playoffs appearance in Sir John Kirwan's first season in charge.
In a scrappy game at Bloemfontein, they were well beaten 34 - 13 by the fast finishing Cheetahs, who have made the finals for the first time in their eight-season history.
With a round still to play, the top six contenders are already known. The Cheetahs will join the Chiefs, Bulls, Brumbies, Crusaders and Reds. The sixth-placed Cheetahs are guaranteed four points from their final round bye.
The Blues' playoff bid looked in trouble after a late Sharks' try sent them to defeat in the previous round. They were found wanting against the Cheetahs, and looked a long way short of title-contending material in what has become a disappointing end to a season that started with optimism via victories over the Hurricanes and Crusaders Captain Ali Williams, in his post match television interview, paid tribute to the Naka Drotske-coached Cheetahs who he described as playing like "men possessed".
The Blues' problems included an inability to maintain possession and a haphazard kicking game. As against the Sharks, their scrum struggled although on this occasion the pack did have their moments of success in a topsy-turvy battle.