OK, the thing is that i have both options, to make a rig of 20 or more odroids (8 core, 2 GB ram and 1 HHDs of 1 TeraByte) i have a 100 Mb Bandwidth connection in my office so i could dedicate between 40 to 50 Mb of Bandwidth to the rig with out any problem.
The second option is to Install 1 odroid (8 core, 2 GB ram, 1 HDDs 1 Tera Byte) in 21 different location with 2 Mb Bandwidth (this because the connections are between 10 and 20 Mb, so i could not use more then 2 Mb for the network because it has other users)
What it would be best? it should be the same or not?
i see that the test you were doing are base on a 6 Mb so to support any node it has to be at least 6 Mb no matter if the hardware it´s has fast or slow processor and big or small HDDs etc.