said by Mele20:
Powerboost is not supported on Turbo (either grandfathered tier or the new turbo tier) either. It is only on 10/1. Turbo is a joke as it is actually slower than Standard because it has no Powerboost.
From the North Texas (Dallas) website:
Road Runner® Broadband Turbo
20.0 Mbps with PowerBoost®
Our fastest Road Runner ever [sic]- giving you the speed you need for a super fast web experience. PowerBoost® gives you an extra burst of speed when downloading big files, so videos, music and files go even faster than before.