Thanks you two. =)

A couple of things:

1. I am running WoW from 4 completely seperate copies, so that's not it.
2. I am running with literally nothing else running. Only things in Task Manager showing up are the essential system resources (like services). Also nothing else is showing up as using any CPU when I play, just the 4 instances and KeyClone.
3. I am not "claiming" it can't run 4, on the contrary, I believe it should be able to. I am trying to figure out why it can't run 4 smoothly.

I'll give the /console commands a try.