I have done extensive research. I searched up and down this forum. I have seen many conflicting reports. This is my situation. I purchased a Late 2013 iMac with 1TB Hard drive for a ridiculous price. The price worked out to be $198 Cash out of my pocket. I also have a 2012 Macbook Pro. Which i opened and did a Maxed out Ram upgrade and put a 500GB SSD in. That was a piece of cake. I was looking into swapping out the iMac SSD and Ram. But from what im reading I cant because my computer didnt come with a SSD. So it doesnt have a bracket i need or something. I decided that I didnt want to void my warranty so Im holding off on tearing it apart. As an Alternative. I was looking into External SSD options. when researching i saw that you cannot have over a certain GB of SSD becasue of power issues. Is this true? What GB SSD should I get. My main goal is to get a Samsung SSD and install El Capitain on it. That way My computer moves way faster. What are the best SSD options? I was looking at this Samsung T1 Portable 500GB Is there a significant difference between 3.0 and Thunderbolt? I would appreciate some guidance.