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We have investigated the upper bound of the radiation energy in the head-oncollision of two Myers-Perry black holes. Initially, the two black holes arefar away from each other, and they become one black hole after the collision.We have obtained the upper bound of the radiation energy thermodynamicallyallowed in the process. The upper bound of the radiation energy is obtained ingeneral dimensions. The radiation bound depends on the alignments of rotatingaxes for a given initial condition due to spin-spin interaction. We have foundthat the collision may not be occurred for a initially ultra-spinning blackhole.

The Upper Bound of Radiation Energy in the Myers-Perry Black Hole Collision