There is a limit and it's set by PFlow.

"Particle system has

an upper limit of a total number of particles in the system. At each moment of time

particle system is able to calculate the current number of particle in the system and

how many particles are allowed to be generated to not exceed the limit threshold. Birth and

Spawn Operators use this method to find out how many particles they are allowed to generate"

Kresimir

Ok, I wasn't sure if there was an operator imposed limit or it if was system based.

As of 2009 extension pack the limit was raised to 1 billion particles per source (64-bit max).

So I assume the the FFX Birth will let me born 1 billion particles. Is that correct?