Hello! I hope you can help please. I have recently purchased a 2017 4k Retina iMac. It runs slow, notably slowr than my 2012 MacBook Air which is due to the slow 5400rpm hard drive. I have been researching SSD alternatives and have just ordered this drive: Crucial CT500MX500SSD1(Z) MX500 500 GB 3D NAND SATA 2.5 inch Internal SSD https://www.amazon.co.uk/dp/B0784SLQM6/ref=cm_sw_r_cp_api_i_uA73AbT5XDW5Q I have some queries: 1. Do I need a thermal controller? I’ve read both yes and no for the newer models? 2. What is the best way to save losing data as I am fully replacing the hard drive? 3. Can you please recommend the correct kit and mounting caddy required that’s compatible with my model? Thanks for your help!