About "Enable Dual Core" on a Single Core Processor...

[XSFOX]

I recently had this off on my Dolphin and noticed the games weren't using all CPU up, but with this on It uses it 100% and I gain a massive boost in game speed. (Some games I can even play full speed, Gotcha Force, games like Kirby Air ride and Melee are almost 100%)


Can I have a Explanation on this? Does Dual Core Enable check box do something else besides Just activating Dual core?