There are several reasons why you are wrong, the first of which being that a Colossus Voulge CANNOT have more than 4 sockets...

As far as ED%, simple math dictates otherwise, 'tard.

EBOTD Colossus Voulge (415% one) = 1272 Max damage
165 max damage * 1.5 for 'Ethereal' property = 247 max damage
247+247(100%)+247(200%)+247(300%)+247(400%)+(247*0 .15[15%]) = 1272

That is obviously less than the 1296 that is listed for THAT Voulge...