Great responses from everyone. I meant to put in the original post that I am using CPU affinity for each instance. When I was three boxing, I had each instance on processors 1,2 and 3. With five I was doubling up 0 and 1 but changed over and doubled 3 and 4 as I watched the load on each processor.

But anyway, I used to try to play multiple instances out of one WoW directory, but I remember getting some type of error on occsassion when trying to do that. I can give it another try and see what happens. Maybe running Keyclone will somehow prevent that error from coming up.

Thanks for the responses,

Johnny