I plan to get the new iMac with the least amount of RAM available (8GB 1600MHz DDR3 SDRAM - 2x4GB). I want to buy additional RAM on my own and upgrade it on my own. 1. How many slots does the new iMac have for RAM? 2. Can I go out and just buy one new 16GB RAM stick OR do you have to get two 8GB sticks? How does this work? Can you add any configuration amount of RAM or does it have to be in certain increments? 3. I'm not sure if I need 64GB of RAM, I'm not sure if I need 32GB. What would be the best amount to upgrade to from the stock 8GB to test performance and consider upgrading from there if necessary? Thanks!