The Black Max has an IBO speed of 330 f.p.s. It was dubbed " the fastest bow" by someone who did an independant study of bows.

The BowTech Extreme VFT IBO' s at 333 f.p.s.

The BowTech Patriot Dually IBO' s at 340 f.p.s.

And the fastest out there is the BowTech BK II which IBO' s at 350 f.p.s.