Well, experiment, but since I always run 1 leader and 4 slaves, and run the main at a much higher resolution, I want that instance to have the most cpu power available, so he gets core 0 and 1. Then each slave gets either core 2 or core 3, so cores 2 and 3 are running 2 instances of wow each. Works well for me.

WTB 6 core processor.... would make things so much easier...