I can't say with absolute certainty how much additional power the match box would use but I would expect it to be minimal. I would think the draw with 4 servos attached would be slightly more than 4 direct connected servos. When driving as many servos as you will be, the Matchbox would be insignificant. I am using Multiplex servos in mine which are individually set via a programmer which accomplishes the same function in a different manner. Keep in mind that the Matchbox only works with JR digital servos.