I think this is at least the third time you've been told this, but with your 49-port hub the limitation won't be power. The limitation will be USB's packet throughput limit, which will cap your total hashrate to about 300GH per connection (which is to say, per hub) due to not being able to keep them provided with work.
I have hubs that I can split the miners.. I just want to test both devices I have raspberry pi and the Udoo quad.. I want to see how fast the system works.. when I run Cgminer with Udoo it is much faster, more responsive then the pi. the pi seems slow motion compared to UDOO. that might play a factor also. Since the UDoo runs Ubuntu 14.04.