so i have download Gfxcardstatus,i switched the settings from dynamic switching to integrated only,is it okay?and which type of situation do i need to use the discrete only?
You will know when to enable the Discrete GPU if performance is slow, choppy etc. that would be when. Some examples would be playing video games, graphic editting, and video editting. The Intel 3000 HD is capable of doing the majority of tasks on OSX though. I generally never enable the Discrete GPU when I'm mobile on the go without a power source, use Safari too you get more battery life with it versus Firefox or Chrome.