said by sticks435:Extreme and ultimate are slightly over provisioned. 50 meg is actually closer to 55-58 and 100 is closer to 110 ish said by Steve Mehs:
The DOCSIS 3 speeds tiers (Extreme and Ultimate), do not feature Power Boost.
I don't know if that is completely accurate. WHen I was downloading from Steam the other night, I was getting 56-57Mbps on my 50 down plan.