Wonderful guide! I was afraid that I am not going to make it since I don’t have a lot of experience in such things but following the steps carefully, paying attention to every detail, has led me to successfully upgrade my iMac 3086 with 1TB SSD and 32GB RAM. I was really afraid that this RAM upgrade probably won’t work because it’s been said on everymac.com that the maximum is 16GB and I’ve read somewhere about a person whose iMac didn’t even start after such intervention. I decided to purchase Crucial 2x16GB at 2400MHz, despite that the iMac has 2133Mhz bus. I trust this brand and I’ve already upgraded my MacBook Pro 15” mid-2012 with the same brand, again pushing the RAM beyond the official limits and it still works great. The SSD I put here is also from Crucial and I just turned on the iMac and it runs like never before! The whole procedure took me a bit over 2 hours. Thanks for the great work with this guide!!!