Hi There,

Imagine this....with a dual core CPU imagine its 2 processors in one, and with a quad core is like having 4 processors in one.

Assigning affinity is basicly selecting the wow client to use a part of the processor.

So in your case by setting the affinity you can make 4 clients assigned to each core of the processor = 4 clients = 4 sections to the processor
this helps with performance.

This is the most easy way of looking at it.