I have been using Keyclone to set my affinity. The affinity settings in the app only allow you to select one CPU per instance, so I went into the keyclone config file and set the affinity mask to 0x0F I don't remember if the number was represented as a hex, or as a decimal number (I'm at work now - so can't check). This tells keyclone to set each instance to all four cores, which is what I wanted... give all 5 access to all cores and let the OS figure it out.