Dual Video Card

Hi, i am using a laptop which has 2 VGA card.
1. Intel(R) HD Graphics 4000 (Onboard)
2. NVIDIA GeForce GT 640M LE

My system information:
Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz 2.90 GHz
8,00 GB RAM
64bit Windows 8 Pro

My FPS is about 90. I think my 2. video card is not working on game. How can i activate the 2. VGA card. Please help me.

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