So for those of us running on a dual core processor what setting would you suggest for affinity?

You can't do anything. The vast majority of players came from WoW and knew that Horde generally had the better players and best guilds so everyone rolled the Horde equivalent in SWTOR. I was going to roll Empire but saw the way the winds were blowing prior to release and I wanted to join the underdogs so I went to the Republic.