From my understanding, one is supposed to be dedicated to projecting out my HDMI port, the Intel 4000 HD.
My question is, what is actually happening when I game? Are both GPUs being used, one to project out while the other solely focuses on the game running? Or does the Intel 4000 HD get shut off and the 660M projects out and runs?
Both cards are powering your game. Intel HD4000 is in case you want to shut off your graphics card, save battery but still play games, though it won't be as good as the 2 660M.
Yeah, I saw I have control over what GPU is used for what programs in the NVIDIA controls. So does that mean only one GPU is used at a time? Or is the intel 4000 HD always projecting out for my monitor?
The HD4000 will be used when you don't need much power from the GPU. This helps to keep things cool and quiet and will use a lot less power than the 660m, which means you'll last longer on battery.
It always seemed odd to me to add that complexity. The 660m, and any of nVidia's graphic chips, will throttle down if your not using it. Set it to battery saver if you really don't need the performance.
I've had a few laptops with duel graphics, and I've gotten better battery life by setting the faster GPU to battery savings and running only that, then running the integrated. And not by a small amount, by a large amount.
On one of my old HP laptops, using the integrated gave me 2.5 hours of constant video (movies) On the same laptop, a year later when the power went out in the house again, I used the proper video chip and it gave 3.5 hours. And that's with a battery that was a year older by that point.
I've seen the same result on my work laptop that has a radeon of some sort. It nearly doubles the life using the graphics chip rather than the integrated. From just using the desktop with Aero turned on.
He who stumbles around in darkness with a stick is blind. But he who... sticks out in darkness... is... fluorescent! - Brother Silence