I currently have a 750GB 5400 RPM hardrive in my Macbook Pro 17" (May 2011). I want to add a SSD (Corsair Force Series GT 120 GB SATA 2.5-Inch) to it. Should I install the SSD in the optibay slot or in the main harddrive slot next to the battery? In other words, are both slots SATA III? If they are both SATA III, then it shouldn't matter where I install it, right? What about heat issues. Is one slot better with heat over the other? Thanks.