I have an G750-jm and i was wondering if the second drive bay is sata 3.

I have an ASUS ROG g750jm and when i open gpu tweak it says its running on the integrated graphics with the i7, anyone know how i can switch to the gpu?

I have an ASUS ROG g750jm and when i open gpu tweak it says its running on the integrated graphics with the i7, anyone know how i can switch to the gpu?