I am currently in the process of revamping my Mid-2009 Macbook Pro 2.8GHz Intel Core 2 Duo with 8GB RAM, 240GB Crucial M500 SSD, A new battery, and replacing the SuperDrive with a Seagate Momentus XT 750GB using a hard drive caddy. From doing some research I am to understand that my connection for the Optical drive as well as the HD slot is SATA II rather than SATAIII. If I put a 6GB/s drive (SeagateXT) into this connection will I experience any problems or just a slow down of speed? Will I be able to reach 3GB/s in my optical drive, or would it slow down to a negotiated speed of 1.5GB/s? Would there be any difference in speed if I just transferred my 5400RPM 500GB drive in this slot? I notice my stock 500GB HD in the HD bay has a 3GB/s connection but runs at a negotiated speed of 1.5GB/s. Will my M500 SSD be able to reach 3GB/s in the main HD slot? Any other things I should be aware of during this process, Enabling TRIM? Reformatting my computer? Fresh install of Mavericks? Or any complications I may experience along the way? I just want to be able to make sure that I get my moneys worth and maintain the boost my computer needs to be able to support FCPX video editing and overall stability.