MouseMonkey is right, auto will allow for the system to decide what is best. If you set something so that is no longer auto you may end up with one game running great and another running poorly. Auto should help to fix this from possibily happening.
@deweycd, ur right that one, but I'm still trying to find ways how to utilize my dual gpu, cause some games are not optimize on dual gpu like starcraft 2.
when I disable the dual gpu mode and use only one gpu, it gets same performance.
I'm trying to find ways to utilize it even a little.