Not sure whether to post this in the mobo section or here, so please move if it's in the wrong section 
I've done some reading around this and understand that this switches between the integrated graphics and the GPU, or using both or something like that?
I was just wondering what exactly it does in more laymans terms...
I've also read that it can give large fps boosts, but some say that's only when using lower end graphics cards, and sometimes it decreases the fps, some say it makes very little difference... so what is it and does it work?
Many thanks

I've done some reading around this and understand that this switches between the integrated graphics and the GPU, or using both or something like that?

I've also read that it can give large fps boosts, but some say that's only when using lower end graphics cards, and sometimes it decreases the fps, some say it makes very little difference... so what is it and does it work?
Many thanks